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Table 2 Predictive values and likelihood ratios of self-reported undetectable VL in overall CHIWOS cohort (n = 336)

From: Validating a self-report measure of HIV viral suppression: an analysis of linked questionnaire and clinical data from the Canadian HIV Women’s Sexual and Reproductive Health Cohort Study

   PPV (95% CI) NPV (95% CI) LR+ (95% CI) LR− (95% CI)
  Laboratory-confirmed VL (from BC-CfE)a     
  VL <50 copies/mL VL ≥50 copies/mL     
Self-report VL (from CHIWOS)
 Undetectable (i.e. <50 copies/mL) 267 18 93.7 (90.2–96.2) 80.4 (66.9–90.2) 3.2 (2.1–4.6) 0.05 (0.03–0.10)
 Detectable (i.e. ≥50 copies/mL) 10 41     
  1. PPV positive predictive value, NPV negative predictive value, LR+ positive likelihood ratio, LR− negative likelihood ratio, 95% CI 95 percent confidence interval, VL viral load, BC-CfE BC Centre for Excellence in HIV/AIDS, CHIWOS Canadian HIV Women’s Sexual and Reproductive Health Cohort Study
  2. aGold standard (True diagnosis)