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Table 2 2 × 2 table for example 1

From: Calculating confidence intervals for impact numbers

  

Death from CHD

 
  

yes

no

∑

Exposure

smoker

69

10263

10332

 

non-smoker

100

24008

24108

 

∑

169

34271

34440

  1. The absolute numbers in this table are calculated using the sample size of the study (34440), the annual CHD death rates for smokers (Ï€1 = 0.669%) and non-smokers (Ï€0 = 0.413%), and a hypothetical prevalence of smoking of 30% in the study population.