Self-reported current STI symptoms Self-reported past STI symptoms Self-reported recent condom non-use Self-reported inconsistent condom use
Laboratory diagnosis (any STI)   Yes No Yes No Yes No Yes No
Yes 26 486 67 445 256 256 381 131
No 139 3244 384 2999 1590 1793 2671 712
  SEN=5 PPV=15.7 SEN=13 PPV=14.8 SEN=50 PPV=13.9 SEN=74.4  PPV=12.4
SP=95.8 NPV=86.9 SP=88.6 NPV=87 SP=52.9 NPV=87.5 SP=21 NPV=84.4
  Self-reported currentSTI symptoms and/or inconsistent condom use Self-reportedpast STI  symptoms and/or inconsistent condom use Self-reportedrecent condom non -use and/or current STI symptoms Self-reportedrecent condom non -use and/or  past STI symptoms
Laboratory diagnosis (any STI)   Yes No Yes No Yes No Yes No
Yes 386 126 399 113 268 244 291 221
No 2692 691 2742 641 1629 1754 1773 1610
    SEN=75.3 PPV=12.5 SEN=77.9 PPV=12.7 SEN=52.3 PPV=14.1 SEN=56.8 PPV=14
SP=20.4 NPV=84.5 SP=18.9 NPV=85 SP=51.8 NPV=87.7 SP=47.5 NPV=87.9
Note: STI symptoms refer to any of the following: genital/anal ulcer or sore/rectal discharge/defecation pain on defecation /burning urination pain/urethral discharge/ groin swelling; Sensitivity(SEN) denotes the proportion of MSM who reported current STI symptoms and also who had a laboratory- diagnosed any STI. Specificity (SP) denotes the proportion of MSM who did not report current STI symptoms and also who did not have a laboratory- diagnosed any STI .PPV and NPV denotes positive predictive value and negative predictive value respectively. Laboratory diagnosis was used as the gold standard for calculating values; N=3895.
Table 3: Sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) of self-reported STI symptoms, recent condom non- use and inconsistent condom use for laboratory-diagnosed STIs among MSM, Andhra Pradesh, Tamil Nadu and Maharashtra, India.
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