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Table 3 Distribution of categorical potential confounders in the weighted and unweighted study samples

From: An application of propensity score weighting to quantify the causal effect of rectal sexually transmitted infections on incident HIV among men who have sex with men

  Unweighted Weighted
Variable (Exposure group) Proportion Standardized bias Proportion Standardized bias
Black race (STI) 62 0.39 47 0.02
Black race (No STI) 43   46  
Reported drug use (STI) 58 0.09 55 <0.01
Reported drug use (No STI) 54   54  
Reported RAI (STI) 85 0.38 79 0.18
Reported RAI (No STI) 69   71  
Reported black partners1 (STI) 52 0.27 41 0.02
Reported black partners1 (No STI) 38   40  
Reported UAI1 (STI) 75 0.23 61 −0.09
Reported UAI1 (No STI) 64   66  
Non-rectal STI diagnosis2 (STI) 23 0.45 10 0.02
Non-rectal STI diagnosis2 (No STI) 7   10  
  1. 1In the interval of diagnosis/censoring.
  2. 2Urethral GC, urethral CT or syphilis.