12
Original Research Why the Scots die younger: Synthesizing the evidence G. McCartney a, *, C. Collins b , D. Walsh c , G.D. Batty d,e a Public Health Observatory, NHS Health Scotland, 4th Floor, Elphinstone House, 65 West Regent Street, Glasgow G2 2AF, UK b School of Social Sciences, University of the West of Scotland, Paisley, UK c Glasgow Centre for Population Health, Glasgow, UK d UCL Epidemiology and Public Health, London, UK e Medical Research Council Social and Public Health Sciences Unit, Glasgow, UK article info Article history: Received 24 January 2011 Received in revised form 5 December 2011 Accepted 15 March 2012 Available online 10 May 2012 Keywords: Scotland Glasgow Mortality Scottish effect Glasgow effect Causality Synthesis summary Objective: To identify explanations for the higher mortality in Scotland relative to other European countries, and to synthesize those best supported by evidence into an overall explanatory framework. Study design: Review and dialectical synthesis. Methods: Candidate hypotheses were identified based on a literature review and a series of research dissemination events. Each hypothesis was described and critically evaluated in relation to the Bradford-Hill criteria for causation in observational epidemiology. A synthesis of the more convincing hypotheses was then attempted using a broadly ‘dialectical’ approach. Results: Seventeen hypotheses were identified including: artefactual explanations (depriva- tion, migration); ‘downstream explanations’ (genetics, health behaviours, individual values); ‘midstream’ explanations (substance misuse; culture of boundlessness and alienation; family, gender relations and parenting differences; lower social capital; sectarianism; culture of limited social mobility; health service supply or demand; deprivation concentration); and ‘upstream’ explanations (climate, inequalities, de-industrialization, political attack). There is little evidence available to determine why mortality rates diverged between Scotland and other European countries between 1950 and 1980, but the most plausible explanations at present link to particular industrial, employment, housing and cultural patterns. From 1980 onwards, the higher mortality has been driven by unfavourable health behaviours, and it seems quite likely that these are linked to an intensifying climate of conflict, injustice and disempowerment. This is best explained by developing a synthesis beginning from the polit- ical attack hypothesis, which suggests that the neoliberal policies implemented from 1979 onwards across the UK disproportionately affected the Scottish population. Conclusions: The reasons for the high Scottish mortality between 1950 and 1980 are unclear, but may be linked to particular industrial, employment, housing and cultural patterns. From 1980 onwards, the higher mortality is most likely to be accounted for by a synthesis which begins from the changed political context of the 1980s, and the consequent hope- lessness and community disruption experienced. This may have relevance to faltering health improvement in other countries, such as the USA. ª 2012 The Royal Society for Public Health. Published by Elsevier Ltd. All rights reserved. * Corresponding author. Tel.: þ44 0141 354 2928. E-mail address: [email protected] (G. McCartney). Available online at www.sciencedirect.com Public Health journal homepage: www.elsevier.com/puhe public health 126 (2012) 459 e470 0033-3506/$ e see front matter ª 2012 The Royal Society for Public Health. Published by Elsevier Ltd. All rights reserved. doi:10.1016/j.puhe.2012.03.007

Why the Scots Die Younger: Synthesizing the Evidence

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p u b l i c h e a l t h 1 2 6 ( 2 0 1 2 ) 4 5 9e4 7 0

Available online at w

Public Health

journal homepage: www.elsevier .com/puhe

Original Research

Why the Scots die younger: Synthesizing the evidence

G. McCartney a,*, C. Collins b, D. Walsh c, G.D. Batty d,e

a Public Health Observatory, NHS Health Scotland, 4th Floor, Elphinstone House, 65 West Regent Street, Glasgow G2 2AF, UKb School of Social Sciences, University of the West of Scotland, Paisley, UKcGlasgow Centre for Population Health, Glasgow, UKdUCL Epidemiology and Public Health, London, UKeMedical Research Council Social and Public Health Sciences Unit, Glasgow, UK

a r t i c l e i n f o

Article history:

Received 24 January 2011

Received in revised form

5 December 2011

Accepted 15 March 2012

Available online 10 May 2012

Keywords:

Scotland

Glasgow

Mortality

Scottish effect

Glasgow effect

Causality

Synthesis

* Corresponding author. Tel.: þ44 0141 354 2E-mail address: [email protected] (G.

0033-3506/$ e see front matter ª 2012 The Rdoi:10.1016/j.puhe.2012.03.007

s u m m a r y

Objective: To identify explanations for the higher mortality in Scotland relative to other

European countries, and to synthesize those best supported by evidence into an overall

explanatory framework.

Study design: Review and dialectical synthesis.

Methods: Candidate hypotheses were identified based on a literature review and a series of

research dissemination events. Each hypothesis was described and critically evaluated in

relation to the Bradford-Hill criteria for causation in observational epidemiology. A synthesis

of themore convincing hypotheseswas then attempted using a broadly ‘dialectical’ approach.

Results: Seventeen hypotheses were identified including: artefactual explanations (depriva-

tion, migration); ‘downstream explanations’ (genetics, health behaviours, individual values);

‘midstream’ explanations (substancemisuse; culture of boundlessness and alienation; family,

gender relations and parenting differences; lower social capital; sectarianism; culture of

limited social mobility; health service supply or demand; deprivation concentration); and

‘upstream’ explanations (climate, inequalities, de-industrialization, political attack). There is

little evidence available to determine why mortality rates diverged between Scotland and

other European countries between 1950 and 1980, but the most plausible explanations at

present link to particular industrial, employment, housing and cultural patterns. From 1980

onwards, the higher mortality has been driven by unfavourable health behaviours, and it

seems quite likely that these are linked to an intensifying climate of conflict, injustice and

disempowerment. This is best explained by developing a synthesis beginning from the polit-

ical attack hypothesis, which suggests that the neoliberal policies implemented from 1979

onwards across the UK disproportionately affected the Scottish population.

Conclusions: The reasons for the high Scottish mortality between 1950 and 1980 are unclear,

but may be linked to particular industrial, employment, housing and cultural patterns.

From 1980 onwards, the higher mortality is most likely to be accounted for by a synthesis

which begins from the changed political context of the 1980s, and the consequent hope-

lessness and community disruption experienced. This may have relevance to faltering

health improvement in other countries, such as the USA.

ª 2012 The Royal Society for Public Health. Published by Elsevier Ltd. All rights reserved.

928.McCartney).oyal Society for Public Health. Published by Elsevier Ltd. All rights reserved.

p u b l i c h e a l t h 1 2 6 ( 2 0 1 2 ) 4 5 9e4 7 0460

Introduction

Life expectancy in Scotland (75.8 years for men and 80.4 years

for women in 2008e2010), particularly the West of Scotland

and Glasgow (71.6 years for men and 78.0 years for women in

2008e2010),1,2 is markedly lower than that in other European

nations and the rest of the UK (Fig. 1).3 However, mortality has

not always been worse in Scotland; it was only from around

1950 onwards that Scottish life expectancy diverged.3,4 From

the mid-point of last century, higher mortality rates were

largely attributable to chronic disease: cardiovascular disease,

stroke and cancer. Alcohol-related deaths, togetherwith those

ascribed to ‘external’ causes including suicide, were all lower

in Scotland from 1950 to 1980 than in otherWestern European

countries.3 The Scottish mortality differential intensified

during the 1980s, and its composition changed.5e7 Mortality

rates increased for alcohol- and drug-related deaths, ‘external

causes’ (principally violent deaths and road traffic accidents)

and suicide. This added to continuing high rates for cardio-

vascular disease,8 cancer and stroke.7,9e11 Furthermore, the

ability of the Carstairs Index (a measure of area deprivation

derived from census data) to explain the excess mortality in

Scotland12,13 compared with England and Wales declined

from around two-thirds in 1981 to under half in 1991 and

2001.14 Over the same time period, the excess in mortality

increased. The reason(s) for this is (are) not clear, and this has

led to the labelling of this modern phenomenon as the ‘Scot-

tish effect’.5,15

To the authors’ knowledge, this is the first report to collate

the various hypotheses proposed to explain the higher

mortality during these two distinct periods of divergence, and

25

35

45

55

65

75

85

1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010

Year

Life

exp

ecta

ncy

at b

irth

(yea

rs)

Fig. 1 e Trends in life expectancy of the Scottish population

(in red) in comparison to other Western European

countries* during the 20th century (data from the Human

Mortality Database).119 (For interpretation of the references

to colour in this figure legend, the reader is referred to the

web version of this article.) *Western European nations for

which data were included were: Austria, Belgium,

Denmark, England and Wales, Finland, France, Ireland,

Iceland, Italy, Luxembourg, Netherlands, Northern Ireland,

Norway, Portugal, Scotland, Spain, Sweden, Switzerland

and West Germany.

evaluate how well each can be seen to explain the trends by

reviewing the current evidence base in light of the Bradford-

Hill criteria for causality based on observational data.16 This

was done in order to develop amore integrated understanding

of the contributory causes of the mortality phenomena.

Investigating the pattern of Scotland’s mortality divergence

may also help to inform efforts to explain faltering health

improvement in other countries during the 1980s, such as the

USA.17

Methods

A five-pronged approach was used to search for evidence: (1)

Embase (1980eApril 2010) and Medline (1950eApril 2010)

electronic databases were searched using the strategy out-

lined in Webtable 1; (2) key authors’ websites were searched

for other publications; (3) reference sections of key papers

were scrutinized; (4) publications citing these papers were

traced (forward citation); and (5) an internet (Google) search

was undertaken based on the terms ‘Scottish effect’, ‘Glasgow

effect’, ‘excess mortality Scotland’ and ‘excess mortality

Glasgow’, and the first 50 hits were scrutinized. Additional

non-systematic literature searches for each of the hypotheses

where no evidence was uncovered in the formal literature

review detailed above were also performed. These searches

were targeted towards the specific hypothesis rather than the

generality of the Scottish effect or higher Scottish mortality,

but were, as indicated, not systematic. The authors of the

initial work on the ‘Scottish effect’ have been involved in

presentations of their work at conferences and seminars.5 The

hypotheses raised in the ensuing discussions have also been

included in this paper.

In 1965, Austin Bradford-Hill outlined a set of criteria to be

used in evaluating whether an association between two

factors is likely to be of a causal nature.16 The criteria are:

strength of association, consistency, specificity, temporality,

biological gradient, plausibility, coherence, experiment and

analogy. Each of the hypotheses was evaluated using these

criteria. In doing this, it was recognized that some criteriamay

carry more weight than others in either ‘disproving’

a hypothesis or in making it more likely to be a causal expla-

nation.16,18,19 The criteria relating to experimental evidence

were interpreted broadly to include, for example, natural

experiments.

In line with the various social models of health,20e22

hypothetical causes were classified as: artefactual, ‘down-

stream’ or ‘proximal’ (such as alcohol misuse), ‘midstream’

(such as family, gender relations and parenting differences),

and ‘upstream’ or ‘distal’ (such as deindustrialisation).23e25 A

synthesis was then attempted, drawing on those hypotheses

which appeared robust against the Bradford-Hill guidelines

and seemed to offer at least partial insights into the

phenomenon. The aim was to develop a more interconnected

or holistic understanding of the contributory causes. This

involved drawing loosely on the dialectical approach to

knowledge development taken by Hegel.26,27 The synthesis

was developed based on the view that the causal pathways

were likely to be complex rather than linear28; that some

p u b l i c h e a l t h 1 2 6 ( 2 0 1 2 ) 4 5 9e4 7 0 461

explanations were likely to be necessary but insufficient; and

that distinct hypotheses may reflect differing viewpoints on

the same phenomena, and may deal with different parts or

elements of a single causal pathway.

A fuller description of the methods, results and discussion

is given elsewhere.29

Results

The electronic database search yielded 309 potentially rele-

vant papers. From these, 76 were selected for detailed exam-

ination on the basis of the relevance of the title and abstract.

The notes from the discussions at various fora for the

dissemination of previous research5,9,10,12,13 identified further

hypotheses which were not reflected in the academic

literature.

In total, 17 hypotheses were identified which addressed

either: the higher mortality in Scotland, the higher mortality

in Glasgow (or the West of Scotland), the excess mortality in

Scotland after accounting for deprivation (Scottish effect), or

the excessmortality in Glasgow (or theWest of Scotland) after

accounting for deprivation (Glasgow effect). As indicated

above, some of the hypotheses are clearly closely related, and

others can also be linked. The hypotheses are dealt with below

in the following order: artefactual explanations (deprivation

and migration), ‘downstream’ explanations, ‘midstream’

explanations and ‘upstream’ explanations. The evidence

identified in each case is summarized and briefly appraised.

Where possible, evidence is given comparing Scotland with

England and Western Europe, and comparing Glasgow with

the rest of Scotland and other cities. For some of the hypoth-

eses, there has been little or no research. This does not

preclude the possibility that they will prove to be relevant in

the future, and a programme of research which will consider

a number of them is due to begin soon. Table 1 summarizes

how, in light of the currently available evidence, each of the

hypotheseswas found to fare against the Bradford-Hill criteria

for each of the time periods and population comparisons (i.e.

Glasgow compared with Scotland, Scotland compared with

England, Scotland compared with Western Europe) under

consideration. The links and relationships between the

hypotheses as regards the two periods are then dealt with

later in the paper.

Deprivation

HypothesisGreater deprivation in Scotland, particularly in the West of

Scotland and Glasgow, explains Scotland’s health trends.

EvidenceIn 1981, the majority of the excess mortality in Scotland,

compared with the rest of Britain, could be accounted for by

use of the Carstairs Index (a measure of area deprivation

derived from census data based on car ownership, over-

crowding, male unemployment and social class).14 The terms

‘Scottish effect’ or ‘Glasgow effect’ reflect the decline in the

proportion of the excess which could be so explained in 1991

and 2001, by reference to Carstairs or other available

measures of deprivation.5 One suggestion is that, in reality,

higher deprivation would account for a much higher propor-

tion of the excess, but that thesemeasures no longer ‘capture’

it effectively, either within Scotland or in comparison with

England (as differently sized urban populations were

compared between Scotland and England/Wales).30,31 Thus,

for the post-1980 period only, the suggestion is that the

‘effects’ are actually ‘artefacts’ created by inadequate depri-

vation measures. No evidence was identified that compared

deprivation levels between Scotland and other European

nations from 1950. The areas within the UK which show the

greatest deprivation have the greatest excess mortality.6,7

However, for the period 2003e2007, areas in Manchester and

Liverpool showed significantly lower mortality than areas of

similar size and income deprivation in Glasgow.12,13

Migration

HypothesisThere was a greater degree of emigration of healthy individ-

uals from Scotland than from other areas (the flip side of the

‘healthy migrant effect’).32e34

EvidenceAlthough there has been substantial emigration,6 recent

migrants display amortality pattern very similar to that of the

non-emigrating population and retain their higher mortality

rates.35e39 However, deprivation and localized migration does

explain much of the concentration of mortality within

Scotland.40e43

Genetic differences

HypothesisThe population is either predisposed to negative health

behaviours or is particularly vulnerable to the effects of such

behaviours due to genotype.

EvidenceThemigration studies are supportive of a genetic cause in that

the emigrant populations from Scotland and Glasgow carry

their mortality patterns with them as they move.35,39,40

However, a genetic cause is much less likely because the

mortality divergence between Scotland and the rest of the UK

seems to have occurred much too rapidly to be explained by

changes in the gene pool.

Health behaviours

HypothesisA higher prevalence of unfavourable health behaviours

(relating to alcohol, tobacco, illicit drugs, physical activity and

diet) is responsible for the mortality patterns.

EvidenceThere is a higher prevalence of problem drug use in Scotland44

and there was a rapid rise in illicit drug-related deaths during

the 1980s.45 Alcohol-related deaths are elevated and have

risen rapidly from around 1990.6 Alcohol consumption in

Glasgow is higher than in the rest of Scotland, even after

Table 1 e Summary of hypotheses and their fit with the Bradford-Hill criteria.

Hypothesis Timeperiod

Number ofcriteria

supportive

Number ofcriteria notsupportive

Bradford-Hill’s criteria for causality

Strength ofassociation

Consistency Specificity Temporality Biologicalgradient

Plausibility Coherence Experiment Analogy

Deprivation 1950e1980 2 2 e X e e e e X , ,

1980e 5 0 e , e e , , , U ,

Migration 1950e1980 4 2 X e e , e , , X ,

1980e 4 2 X e e , e , , X ,

Genetic differences 1950e1980 3 4 e , X X e X X , ,

1980e 3 4 e , X X e X X , ,

Health behaviours 1950e1980 9 0 , , , , , , , , ,

1980e 8 0 U , , , , , , , ,

Individual values 1950e1980 4 0 e , e e e , , e ,

1980e 4 0 e , e e e , , e ,

Different culture

of substance misuse

1950e1980 2 0 e e e e e , e e ,

1980e 2 0 e e e e e , e e ,

Culture of boundlessness

and alienation

1950e1980 2 2 X e e e e , X e ,

1980e 2 2 X e e e e , X e ,

Family, gender or

parenting differences

1950e1980 4 0 , e e , , e , e e

1980e 4 0 , e e , , e , e e

Lower social capital 1950e1980 4 0 e , e e e , , e ,

1980e 5 0 , , e e e , , e ,

Sectarianism 1950e1980 4 2 , X e X e , , e ,

1980e 4 2 , X e X e , , e ,

Culture of limited

social mobility

1950e1980 2 4 e X e X X , X e ,

1980e 2 4 e X e X X , X e ,

Health service

supply or demand

1950e1980 1 4 X e e X X , X e e

1980e 1 4 X e e X X , X e e

Deprivation concentration 1950e1980 4 0 , e e e e , , e ,

1980e 4 0 , e e e e , , e ,

Greater inequalities 1950e1980 7 0 e , , , , , , e ,

1980e 7 0 e , , , , , , e ,

De-industrialization 1950e1980 6 2 , X X , e , , , ,

1980e 5 2 e X X , e , , , ,

Political attack 1950e1980 4 1 e e e X e , , , ,

1980e 9 0 , , , , , , , , ,

Climatic differences 1950e1980 2 0 , e e e e e e e ,

1980e 2 3 , X X e X e e e ,

e, no evidence to demonstrate or refute the consideration; U, uncertainty around whether the evidence supports this criterion;,, balance of evidence supports criterion; X, balance of evidence does

not support criterion.

public

health

126

(2012)459e470

462

p u b l i c h e a l t h 1 2 6 ( 2 0 1 2 ) 4 5 9e4 7 0 463

adjustment for deprivation.46 Similarly, smoking-related

deaths (including cardiovascular disease, respiratory disease

and cancer)6 and smoking prevalence are higher in Greater

Glasgow than Scotland.47e52 Health Survey data relating to

diet, smoking and obesity comparing Scotland with England

do not explain overall excess mortality after adjustment for

deprivation,53,54 but this could reflect incomplete ascertain-

ment of these behaviours whichmay have a cumulative effect

across the life course on mortality experience.

Individual values

HypothesisThere is a higher prevalence of individuals who are more

hedonistic than elsewhere, or have lower aspirations, and

this, in turn, leads to a higher prevalence of adverse health

behaviours and higher mortality.

EvidenceNo evidence was identified relating to this hypothesis,

although it is related to some of the culturally orientated

hypotheses (see below).

Different culture of substance misuse

HypothesisThe way in which substances (illicit drugs, tobacco and

alcohol) are consumed in Scotland/Glasgow differs from

elsewhere, and/or there is a unique culture surrounding their

use which exacerbates their effects (as opposed to the

consumption rates per capita).

EvidenceVery little evidence comparing such cultures was identified,

although a review comparing alcohol cultures reported that

Scotland was not different from England, and not distinctive

in relation to other comparison nations.55

Culture of boundlessness and alienation

HypothesisA culture of boundlessness, hopelessness and alienation

(similar to some cultural patterns observed during the 19th

Century)56e58 is a cause of the higher mortality.

EvidenceThere is conflicting evidence around whether or not

a distinctive subculture exists, or whether differences simply

reflect greater privation and sharpening inequality.59e62

However, it is plausible that such a culture might be associ-

ated with the rise in alcohol-related, drug-related, violent and

suicide deaths.

Family, gender relations and parenting differences

HypothesisFamily breakdown, acrimony between partners or dysfunc-

tional parenting are more prevalent, and have a negative

influence on health.33,63e65

EvidenceNo comparative evidence was identified for this hypothesis,

other than the higher rates of reported domestic violence in

Glasgow than in Scotland overall.6 Some reports suggest that

alcohol misuse and gambling have maintained male identity

in the early 20th Century,66,67 which makes it unlikely to be

the causal exposure since the divergent mortality was not

seen until around 1950. Family disruption is closely associated

with a range of negative social and health outcomes,68,69 and

its prevalence rose rapidly from the early 1970s.70 However,

there is little difference in either lone parenthood or teenage

pregnancies between Glasgow, Liverpool or Manchester (or

between Scotland and England).12

Lower ‘social capital’

HypothesisLower ‘social capital’ is responsible for the mortality patterns.

EvidenceVery few comparative data are available for this hypothesis,

and further work is required to clarify whether there is

a difference between populations. However, some limited

comparisons (including volunteering and electoral attitudes)

suggest that Glasgow does less well than Scotland as a whole

on this indicator, but that Scotland is comparable to England

and Wales,71 and Glasgow is similar to Liverpool and Man-

chester.6 The only exception is the lower religious identifica-

tion in Scotland and Glasgow, although individual-level data

for older groups do not suggest that this has a protective

effect.6,12,72 Fear of crime may be lower in Glasgow than

elsewhere in Scotland, but somemeasures of ‘bonding capital’

may be higher in Scotland.71 The hypothesis is consistent with

the findings of Stuckler et al. in relation to the protective effect

of ‘social capital’ in Eastern Europe in the face of

neoliberalism.73

Sectarianism

HypothesisThe commonly recognized sectarian divide between Catholics

and Protestants in Scotland (and Glasgow and the West of

Scotland in particular) has contributed causally to the

mortality phenomenon.

EvidenceNo evidencewas identified that examinedwhether Scotland is

more affected by such divisions.33,74 However, Northern

Ireland (which undoubtedly has a greater sectarian problem

than Scotland) has reduced its mortality more rapidly than

Scotland since the middle of the 20th Century, and there is no

consistent association between peaks in sectarianism and

mortality in Scotland.34

Culture of limited social mobility

HypothesisA culture of limited aspiration and social immobility, linked to

a lack of confidence (fostered by Calvinism e a particular

Christian teaching which stresses the absolute power of God)

p u b l i c h e a l t h 1 2 6 ( 2 0 1 2 ) 4 5 9e4 7 0464

and other inhibiting social norms, is a cause of the higher

mortality.33,75

EvidenceThis hypothesis focuses on the emergence of cultural patterns

in the first decades of the 20th Century,33 giving a problematic

temporal relation with both mortality divergences. No

comparative evidence was identified for confidence (except

more recently in adolescents).76 Association with Calvinism

(using Presbyterianism as a proxy) is weak since it has always

been more dominant in the North of Scotland,77 and no

evidence was identified to suggest that a ‘cultural Calvinism’

extends to other groups. There is mixed evidence relating to

those associated with the Irish Catholic community in the

West of Scotland, whose younger members suffer greater

deprivation but have similar health outcomes,78 whose adults

are exposed to a worse diet,79 and whose working men have

higher mortality after adjusting for smoking and deprivation

(particularly from cardiovascular disease).80

Health service supply or demand

HypothesisThe quality, accessibility or demand for health services is

a cause of the higher mortality.

EvidenceThere is evidence that the variation in health service use

between Scotland and the rest of the UK is minimal compared

with the variation in the provision of services within regions

and cities,81 but there is an absence of evidence examining the

distribution of the inverse care law (whereby services are

provided in inverse proportion to the need for services).82e84

Scotland has higher health spending than other parts of the

UK,85 although it is unclear if this is related to greater need,

rurality, higher quality or lower productivity.86 No evidence

was identified which compares how National Health Service

resources are deployed (e.g. proportion spent on primary care

in different areas). The quality of primary care is higher in

Scotland (as measured by the Quality and Outcomes Frame-

work), as are vaccination rates, the care of patients with acute

heart attacks and waiting times,85 although making valid

comparisons presents methodological difficulties.87 Most of

the specific causes of mortality which have diverged since

1980 are not normally considered to be amenable to health

care.

Deprivation concentration (‘area effects’)

HypothesisThe deprived areas in Scotland and Glasgow form large,

concentrated, monocultural communities to a greater extent

than elsewhere, and this has a negative causal impact on

health.

EvidenceVariation in Scottishmortality in 2001 was better explained by

including a measure of the deprivation in surrounding

geographical areas, in addition to the deprivation of the

specific area of residence.88

Greater inequalities

HypothesisGreater income inequality is a cause of the phenomenon.

EvidenceThis fits with a growing evidence base which suggests that

health and social outcomes are better in more equitable

nations.89,90 Some studies have found an association between

higher regional income inequality and worse self-rated health

in Britain,89e91 whilst others have found no relation.92 Income

inequality is lower in Scotland than in England,93,94 although

inequality effects may be most profound at a UK level.95,96

De-industrialization

HypothesisA particularly profound de-industrialization was suffered in

Scotland and this is a cause of the phenomenon.

EvidenceScotland (and Glasgow along with the West of Scotland) was

recently found to have higher mortality than comparable de-

industrialized areas across Northern Europe, despite lower

poverty levels and lower unemployment.9,10 The West of

Scotland lost the greatest number of industrial jobs as

a proportion of total employmentwhen comparedwith 10 such

de-industrialized areas across the UK and mainland

Europe,9,10,97 and experienced greater de-industrialization than

elsewhere in the UK (Merseyside being the next worst affected

region).98 There is a close temporal relationship between de-

industrialization and the emergence of the Scottish effect.9,10

Political attack

HypothesisThe UK was exposed to a form of neoliberalism after 1979 e

not seen in other European countries e which amounted to

a political attack on the organized working class. Scotland,

and particularly Glasgow, was more vulnerable than other

parts of the UK (indicated by the relative scale of de-

industrialization and the extent of reliance on council

housing compared with other UK regions). This political

attack provoked a distinctive reaction in sociopolitical culture

encapsulated in the idea of a nation being under ‘attack’ by

a government without a political mandate, creating a ‘demo-

cratic deficit’, which was, in turn, compounded by the relative

acquiescence of local government.99,100

EvidenceDeprivation explains a larger proportion of the excessmortality

betweenScotlandandEngland/Walesuntil the implementation

of neoliberalism by the Thatcher Government in the

1980s.5,6,12,13 Indeed, themortality rates in theWest of Scotland

comparewell with other European de-industrialized areas until

this time.9,10 A mortality pattern similar, if more profound, to

Scotlandappeared in the formerUSSRafter 1989as it undertook

a rapid transition from state communism to free market capi-

talism (including similar cause-specific mortality

patterns).73,101,102 Neoliberalism was implemented most

p u b l i c h e a l t h 1 2 6 ( 2 0 1 2 ) 4 5 9e4 7 0 465

vigorously in the UK comparedwith other European nations.103

TheWestofScotlandhadahigherproportionofcouncilhousing

and industrial employment than other UK regions, and the

specific opposition from the region to the neoliberal politics of

an earlier Conservative administration (that of Edward Heath)

may have made the region a particular target for the

attack.100,104 The electoral trends and historical accounts of the

period after 1979 show a particular reaction, in terms of socio-

political culture, against neoliberalism, indicative of a strongly

intensifying sense of disempowerment.100 Finally, Glasgow is

noted as having had a particular emphasis on accommodating

andpromoting neoliberalismduring the 1980s,whichmayalso,

in part, help explain the greater vulnerability of the city.105,106

Climatic differences

HypothesisA lack of sunlight leads to a deficit in vitaminD,107 and harsher

winters increase mortality through the effects of the cold.

EvidenceThere is evidence of a gradient in vitamin D levels in pop-

ulation blood samples between Scotland and the rest of the

UK (but not between areas in Scotland),108 but there is no

coherence with the problematic cause-specific mortalities nor

clear evidence of temporal changes (although changes in diet

or housing are plausible drivers of such change).108 There

were 51,600 Scottish excess winter deaths between 1989 and

2001, almost all of which occurred in those aged over 65 years,

andmostly in deprived areas such as Glasgow.109,110 Although

important, this could not easily explain the divergence from

1980, which affected younger age groups, nor explain the

cause-specific mortality patterns.7

As indicated earlier, Table 1 summarizes how each of the

above hypotheses was found to fare against the Bradford-Hill

criteria for each of the time periods under consideration.

Synthesis for the mortality divergence 1950e1980

The divergence of Scottishmortality from that of its European

neighbours from 1950 onwards was largely due to a less rapid

Substance misuse

Key determining

factors

Low wage and unstable industrial

employment

Increased stress

Gender disharmony

Possible

Poverty and inequality

Migration patterns

Erosion osocial capit

Overcrowding and poor housing conditions

Lack of vitamin D

Lack of coservices &

Fig. 2 e Simplified representation of the synthesis of the cause of

from 1950 onwards.

reduction in deaths from cardiovascular disease, stroke,

respiratory disease and cancer. There has been less research

into this earlier divergence, and the precise nature of the

causal pathways is therefore far from certain. On balance, it is

likely that a greater exposure to negative health behaviours

such as smoking, alcohol, poor diet and low levels of physical

activity goes some way to explaining the divergence. Cultural

factors (including family, gender relations and parenting

differences, a culture of limited social mobility, and a negative

alcohol culture) may have been operant, but it is less likely

that they are the cause of the divergent pattern (e.g. Scotland

had lower alcohol-related deaths than the rest of Europe until

around 1990).11 It is unclear whether Scotland suffered from

greater poverty than other European nations around 1950, but

it is possible, and in terms of historical accounts plau-

sible,111,112 that unemployment, more precarious industrial

employment, inequality, overcrowded housing conditions

and the large-scale reconstruction which resulted in the

peripheral council housing estates around Glasgow, Edin-

burgh and other large Scottish conurbations could be impor-

tant in providing a causal explanation (Fig. 2). However,

significant new work would be required to investigate this.

More work is also required to determine whether or not

climatic influences (including the role of vitamin D) are

important in explaining the higher mortality in Scotland

during this time. It does not seem likely that genetic factors or

health service quality, supply or demand are important

explanations for the mortality divergence, although there is

little evidence available to examine such suggestions.

Synthesis for the mortality divergence from 1980

It is likely that a proportion of the excessmortality in Scotland

and Glasgow not explained by the Carstairs Index is, in fact,

due to deprivation, and that the Index has become a less

sensitive measure. However, the comparisons of Glasgow,

Liverpool and Manchester provide strong evidence that there

is amortality excess in Glasgow in addition to that attributable

to deprivation.12,13 Migration is unlikely to have played a key

role in generating the higher mortality pattern. It does not

Multiple deprivation

('area effects')

mechanisms Outcomes

f al Cardiovascular

disease

Respiratory disease

Stroke

Cancer

Inequalities

Social isolation

Excess winter deathsmmunity

facilities

Construction of peripheral

council housing

the divergence of Scottishmortality from the rest of Europe

p u b l i c h e a l t h 1 2 6 ( 2 0 1 2 ) 4 5 9e4 7 0466

seem likely that genetic factors, climatic influences or health

service quality, supply or demand are important explanations

for the higher mortality from 1980, the Scottish effect or

Glasgow effect.

A hypothesis showing a strong fit with the Bradford-Hill

criteria concerns the prevalence of various health behav-

iours (particularly alcohol and drug use). Although these

exposures are causal, the synthesis requires an explanation

for the higher prevalence of these negative health behaviours,

or why their effects aremore profound in the Scottish context.

The culturally orientated hypotheses (including individual

values; lower social capital; family, gender relations and

parenting differences; substance abuse; culture of alienation

and boundlessness; and culture of limited social mobility) are

plausible and have some evidence, but require further

comparative research and are challenged in terms of

explainingwhy the Scottish and Glaswegian populations were

worse affected than other areas from the early 1980s (rather

than at an earlier time). These cultural hypotheses, and the

hypothesis relating to negative health behaviours, are there-

fore necessary and important explanations in describing the

causes of the Scottish effect and the Glasgow effect, but are

not sufficient. Structural explanations (including inequalities

and de-industrialization) fit well with the Bradford-Hill

criteria and are likely to have played an important causal

role, but on the basis of the available evidence and the appli-

cation of the Bradford-Hill criteria, the political attack

hypothesis seems to be the strongest upstream candidate,

best placed to bring together the most likely behavioural,

cultural and structural determinants of health into a coherent

narrative which can explain the post-1980 mortality

phenomenon (Fig. 3). However, other posited explanations, for

which there is currently little or no research evidence, may

prove important in developing e or altering e this view. It is

important, therefore, that further research relevant to these

hypotheses is undertaken.

Discussion

Clearly, further work is required on the higher mortality in

Scotland between 1950 and 1980. The most plausible causal

Key

determining

factors

Stress

Possibl

Alienation and boundlessness

Deindustrialisation

Rise in inequality and poverty

Breakdownwork

Poverty and inequality

Industrial dependence

Scottish culture

Trigger

Political attack

Fig. 3 e Simplified representation of the synthesis of the cause

effect.

explanation on the basis of current thinking and available

evidence is that higher poverty, deprivation and inequality

were associated with particular industrial employment

patterns, housing and urban environments, particular

community and family dynamics, and negative health

behaviour cultures. From 1980 onwards, the higher mortality

is driven by negative health behaviours, and it is likely that

these were linked to an intensifying climate of conflict,

injustice and disempowerment. This seems best explained by

the political attack hypothesis which suggests that the

neoliberal policies implemented from 1979 onwards dispro-

portionately affected the Scottish and Glaswegian pop-

ulations. In each case, it is important to bear in mind, as

highlighted previously, that causal pathways are likely to be

complex, and that underlying causes may be compounded or

alleviated by a range of other factors.

Strengths and weaknesses of the study

It is unlikely that there are important hypotheses for the

mortality phenomenon in Scotland (and Glasgow) that were

missed by the search strategy. However, the study has not yet

reached saturation point, and each key publication tends to

generate further speculation. For example, a reviewer of this

paper suggested that the Barker hypothesis113 might provide

some explanation (which it may do, but not without some

exploration of the key differences in pre-birth exposurese not

captured by the measures of deprivation e between the pop-

ulations of interest). The appraisal process using the Bradford-

Hill criteria was robust and is likely to have minimized bias in

the synthesis process. It is, however, possible that some

deductive hypotheses arising from outside the health

research field may have been missed. Furthermore, it may be

that some evidence relating to a particular hypothesis has

been overlooked since the search strategy for each hypoth-

esis, once identified, was not systematic (as performing 17

systematic reviews was not practical). This could have

significantly underestimated the quantity and quality of the

evidence available for a particular explanation, and could

have biased the results of the synthesis. Finally, for some of

the hypotheses, there has been, as indicated previously, little

or no research. Such hypotheses might yet prove to be

Disempowerment and hopelessness

Democratic deficit

Substance misuse

e mechanisms Outcomes

Drugs-related

Alcohol-related

Suicide

Road traffic accidents

Decreased social capital

Violence

in confidence of ing classes

of the higher Scottish mortality from 1980 and the Scottish

p u b l i c h e a l t h 1 2 6 ( 2 0 1 2 ) 4 5 9e4 7 0 467

relevant, and the application of the Bradford-Hill criteria in

this paper should not be seen in any way to preclude that

possibility. A further programme of research which will

investigate a number of them is due to begin soon.

Implications

It is clear that there is a difference between how the Scottish

mortality problem is commonly viewed and the findings of

this preliminary synthesis. Usually, the higher mortality is

attributed to higher rates of smoking, greater alcohol

consumption and poorer diet, which is, of course, truee as far

as it goes. However, such an explanation is not sufficient to

understand why the mortality picture in Scotland is so very

different from that of other, seemingly comparable, areas.

This is a common theme in public health, and exemplifies the

need to consider the ‘upstream causes of the causes’.114e116

The policies of the recently elected UK Conservative-Liberal

coalition include radical cuts to public spending (focused, in

particular, although by no means exclusively, on welfare

benefits), privatizing and residualizing public services, and

massive reliance on private sector growth and entrepreneur-

ialism to provide employment, wealth and welfare. These

policies quite closely resemble the Thatcherite neoliberal

agenda of the 1980s, which this study suggests was closely

connected to processes of community disruption and dis-

empowerment in that decade. This study also suggests that

agenda, theorized as ‘political attack’, is likely to be important

as a point of departure in providing a broad and synthetic

causal explanation for both the Scottish mortality crisis and

for the sharp rise in health inequalities over the last 30

years.117 These policies also closely resemble those which

have had a detrimental impact on aggregate mortality across

Europe.118

Further comparative work to identify which factors played

an important role in the divergence of Scottish mortality from

1950 is merited, as are further systematic reviews of the

literature for each of the identified hypotheses.

Conclusion

For over half a century, Scotland has suffered from higher

mortality than comparably wealthy countries, and for the last

30 years has suffered from a new and troubling mortality

pattern. It is unlikely that any single cause is entirely

responsible, and there is uncertainty around why Scotland

started to diverge from elsewhere in Europe around 1950. It is

clearer that the health and social patterns that emerged from

the 1980s are more closely linked to negative health behav-

iours (e.g. alcohol consumption), but these behaviours are, in

turn, heavily influenced and shaped by the social, cultural and

economic disruption which occurred as the political and

economic policies of the UK changed from the late 1970s. Any

understanding of the Scottish mortality patterning requires,

as well as a clear focus on behaviours, an understanding of the

most ‘upstream’ determinants of health, including those to be

confronted in economic, social and political history. Any

analysis which only refers to tobacco use or alcohol, or even to

‘early years’, massively significant as these factors

undoubtedly are, will inevitably fail to identify the overall

causality of this profoundly troubling phenomenon, and will

be liable to generate, at best, partial policy interventions,

which are, in turn, most liable to prove disappointing in their

outcomes.

Acknowledgements

Ethical approval

None sought.

Funding

None declared.

Competing interests

GM is a member of the Scottish Socialist Party. DW, GDB and

CC have no competing interests.

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