Risk Measures And Screening Practice Test

A 60-year-old man has baseline 10-year MI risk 30%; statin lowers it to 24% (ARR 6%, RRR 20%). Which statement about the number needed to treat (NNT) is correct?​

A 60-year-old man starts statins. Trial data: MI risk 6% with placebo vs 4% with statin over 10 years (ARR 2%, RRR 33%). Which statement about the number needed to treat (NNT) is correct?​