Mexico (2007): Estudio TRaC de VIH/Sida. Evaluacion del Uso del Condon en Hombres que Tienen Sexo con Hombres en Cinco Ciudades Mexicanas. Linea de Base.

In May 2007 PSI/Mexico will conduct a baseline tracking survey for its HIV prevention Program among MSM. survey aims to answer three fundamental questions related to segmentation, monitoring and evaluation of populations. 1) Segmentation: By each risk/behavior combination, which opportunity, ability and motivation (OAM) constructs and population characteristics are significantly correlated with condom use at last anal sex with casual male partners? 2) Monitoring: What are the levels and trends evident in other key behavior, risk, OAM constructs, and exposure to PSI/Mexico's activities? 3) Evaluation: Is exposure to PSI/Mexico's activities leading to changes in OAM, risk, and behavior? The study population for this tracking survey is men who declare have sex with men, who live in the selected cities and visit public inhabited by MSM in those cities and who have had anal sex with a man during the last three months. The study population is limited to men who join in public places inhabited by MSM, as they are the primary target of PSI programs for MSM. This study design employs calls for a time location cluster survey design (TLS). The 2007 survey is considered the baseline. The follow up survey is planned for May 2008.

2007年5月，PSI/墨西哥将针对其男男性行为者（Men who have sex with men, MSM）艾滋病（HIV）预防项目开展基线追踪调查。本次调查旨在解答与目标人群细分、监测与评估相关的三类核心问题：
1. 人群细分：针对每一类风险/行为组合，哪些机会、能力与动机（Opportunity, Ability and Motivation, OAM）维度及人群特征，与最近一次与男性临时伴侣发生肛交时的安全套使用行为存在显著相关性？
2. 监测：其他关键行为、风险因素、OAM维度的水平与变化趋势，以及参与者接触PSI/墨西哥项目活动的情况如何？
3. 评估：参与PSI/墨西哥项目活动是否会带来OAM维度、风险因素及行为的改变？
本次追踪调查的研究人群为：自我报告存在男男性行为、居住于选定城市、造访该城市内男男性行为者常去的公共场所，且近三个月内与男性发生过肛交的男性。本研究人群限定为参与男男性行为者聚集公共场所的男性，因其为PSI男男性行为者项目的核心目标人群。
本研究采用时间-地点整群抽样调查（Time-Location Cluster Survey, TLS）设计方案。2007年本次调查为基线调查，后续追踪调查计划于2008年5月开展。