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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.