Table 3.

Estimated item response probabilities of self-reported use of HIV prevention methods among the HIV-positive participants of the Engage-Montreal study, 2017–2018 (n = 200): 3 class model

Variable	Class 1: Mostly ART with viral suppression n = 87 (53%, 95% CI 41–65%)	Class 2: ART with viral suppression and condom use n = 46 (19%, 95% CI 16–41%)	Class 3: ART with viral suppression and seroadaptive behaviour use n = 67 (18%, 95% CI 10–27%)
ART with viral suppression	84%	86%	93%
Consistent condom use	0%	100%	15%
Strategic positioning	0%	29%	49%
Serosorting and/or PrEP sorting:
Both	0%	8%	55%
PrEP sorting only	9%	0%	16%
Serosorting only	18%	3%	17%

ART antiretroviral treatment, CI confidence interval, PrEP pre-exposure prophylaxis

RDS-II adjusted class sizes (%) and 95% confidence intervals are presented. RDS-II weights are inverse probability of sampling weights that are proportional to participant network size