2. Objectives Understand RR ARR and NNT. Learn how to convert
one to the other. Understand why natural frequencies are so much
more helpful to physicians. 3. RR ARR NNT Whats the difference
between Relative Risk Absolute risk reduction Number needed to
treat 4. Work something out 10% of AMI patients are dead at one
month. A new treatment reduces the mortality to 5% Work out the RR,
ARR and NNT 5. Work something out 10% of AMI patients are dead at
one month. A new treatment reduces the mortality to 5% Work out the
RR, ARR and NNT RR - 5/10 = 50% reduction ARR - 10-5 = 5% reduction
NNT - ARR/100 = 20 patients treated to achieve one positive result.
6. Work something out again 20% of AMI patients are dead at one
month. A new treatment reduces the mortality to 10% Work out the
RR, ARR and NNT 7. Work something out again 20% of AMI patients are
dead at one month.A new treatment reduces the mortality to 10% Work
out the RR, ARR and NNT RR - 10/20 = 0.5 = 50% reduction ARR -
20-10 - 10% reduction NNT - 10/100 = 10 patients to achieve one
positive result 8. RR, ARR, NNTHow much better is it to do an
internal jugular line with ultrasound as compared to an internal
jugular line with landmark method? 9. NNH Number needed to harm
Same as NNT but the other way round 10. More complex stuff
Regression Recursive partitioning Survival analysis Odds ratios 11.
Summary RR ARR and NNT are the same thing. NNT helps us understand
RR often clouds our understanding
