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Table 1 Methamphetamine and Viagra group by percent positive on laboratory test result

From: Methamphetamine and Viagra Use: Relationship to Sexual Risk Behaviors

Lab test Neither drug Meth only Viagra only Both χ2 n p
Hepatitis A 47.8 45.1 44.0 41.5 1.27 649 ns
Hepatitis B 13.0abc 22.8b 26.5c 31.7a 18.5 631 .0003
Hepatitis C 64.0 61.0 66.7 44.1 3.51 157 ns
HIV 3.8ab 8.2b 3.2 9.5a 11.06 1021 .0114
TP-PAa 4.0abc 8.8b 15.6c 15.3a 16.1 580 .0011
RPRb 1.6ac 4.4 6.7c 8.3a 9.5 582 .0233
  1. Note: In all cases df = 3. Proportions in the same row that share the same subscript differ at p < .05 in pairwise χ2 comparisons
  2. aSerodia TP-PA qualitative gelatin particle agglutination assay
  3. bASI rapid plasma reagin test