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Table 3 Two by two table for calculating relative risk

From: Effect of emergency major abdominal surgery on CD4 cell count among HIV positive patients in a sub Saharan Africa tertiary hospital - a prospective study

 

HIV status

Total

 

Exposed (HIV + ve)

Unexposed (HIV-ve)

 
 

N = 25

N = 76

 

Cases (CD4 fall > =64)

12

38

50

Non-cases (CD4 fall <64)

13

38

51

Total

25

76

101

Risk

0.48

0.5

0.50

  

[95% Conf Interval]

Risk difference

−0.02

- 0.25 - 0.21

Relative risk

0.96

0.60 - 1.53

Odds ratio

0.92

0.38 - 2.25

  1. The median CD4 fall in both HIV positive and negative groups was 64 cells/ml.
  2. Fishers exact p-value = 1.00.