Table 2.

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

			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

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

^aGold standard (True diagnosis)