[10] findings from univariate analyses pertaining to the entire MSM sample indicated that increased chance for seroconversion was primarily related to increased numbers of UAI partners, with use of methamphetamine, cocaine, poppers, ecstasy, and alcohol also being independently predictive. Number of UAI partners and use of illicit substances also remained significant in the multivariate model with methamphetamine and popper use increasing the likelihood of seroconversion by 1.5–2 times respectively