Multivariable linear mixed model showing the determinants of unprotected sex within a partnership.

Effect size refers to the effect of the variable in question on the number of unprotected sex acts in the previous two weeks with a single partner. The modal group (denoted by stop mark) was selected as the reference for all categorical variables. Effect sizes and 95% confidence intervals were estimated by Markov Chain Monte Carlo sampling.NOTE. CI, confidence interval.†P-values based on the t statistic with the upper bound for the degrees of freedom.*P-values estimated by Likelihood Ratio Test.All P-values are reported to three decimal places. All other results are reported to two significant figures.