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.效应量（effect size）指所关注变量对研究对象过去两周内与单一伴侣发生无保护性行为次数的影响。所有分类变量均以带有终止标记标注的众数组作为参照基准。效应量与95%置信区间（confidence interval, CI）通过马尔可夫链蒙特卡洛抽样法进行估计。 注：CI即置信区间。†：基于t统计量且以自由度上限计算得到的P值。*：通过似然比检验（Likelihood Ratio Test）估计得到的P值。所有P值均保留三位小数，其余结果均保留两位有效数字。