Sanchez Travis, Smith Amanda, Denson Damian, Dinenno Elizabeth, Lansky Amy
Centers for Disease Control and Prevention, Division of HIV/AIDS Prevention, Atlanta, GA, USA.
Open AIDS J. 2012;6:83-9. doi: 10.2174/1874613601206010083. Epub 2012 Sep 7.
Internet-based sampling methods may reach men who have sex with men (MSM) who don't attend physical venues frequented by MSM and may be at higher risk of HIV infection.
Multivariate logistic regression was used to examine characteristics of adult MSM participants in 2 studies conducted in the same 5 U.S. cities: the 2003-2005 National HIV Behavioral Surveillance System (NHBS) which used sampling from physical MSM venues (e.g., bars, clubs) and the 2007 Web-based HIV Behavioral Surveillance (WHBS) pilot which used sampling through online banner advertisements.
Among 5024 WHBS MSM, 95% attended a physical MSM venue in the past 12 months, and 75% attended weekly. WHBS MSM who were black, aged 18-21 years, not college educated, bisexual- or heterosexual-identifying, and reported unknown HIV serostatus were less likely to have attended a physical MSM venue in the past 12 months (all p<0.01). Compared to NHBS MSM, WHBS MSM were more likely to be white, younger, college-educated, report unknown HIV serostatus, report unprotected anal intercourse with a casual partner, and have first met that partner online (all p<0.0001). WHBS MSM were less likely to have been under the influence of drugs during most recent sex (p=0.01) or not know their sex partner's HIV serostatus (p<0.0001).
Many MSM recruited online also attended physical venues, but attendance varied by sub-group. Participants in WHBS and NHBS differed, and WHBS may represent a group of MSM at higher risk of HIV infection. These findings suggest that an internet-based method may be a useful supplement to NHBS.
基于互联网的抽样方法可能接触到那些不常去男男性行为者（MSM）光顾的实体场所、但感染艾滋病毒风险可能更高的男男性行为者。
在相同的美国5个城市开展的2项研究中，采用多变量逻辑回归分析成年男男性行为者参与者的特征：2003 - 2005年国家艾滋病毒行为监测系统（NHBS），该系统从男男性行为者的实体场所（如酒吧、俱乐部）进行抽样；以及2007年基于网络的艾滋病毒行为监测（WHBS）试点项目，该项目通过在线横幅广告进行抽样。
在5024名参与WHBS的男男性行为者中，95%在过去12个月内去过男男性行为者的实体场所，75%每周都去。在过去12个月内，黑人、年龄在18 - 21岁、未接受过大学教育、自我认同为双性恋或异性恋且报告艾滋病毒血清学状态未知的参与WHBS的男男性行为者去男男性行为者实体场所的可能性较小（所有p<0.01）。与参与NHBS的男男性行为者相比，参与WHBS的男男性行为者更可能是白人、更年轻、接受过大学教育、报告艾滋病毒血清学状态未知、报告与偶然伴侣发生无保护肛交且首次与该伴侣在网上结识（所有p<0.0001）。参与WHBS的男男性行为者在最近一次性行为期间受药物影响的可能性较小（p = 0.01），或者不知道其性伴侣的艾滋病毒血清学状态的可能性较小（p<0.0001）。
许多通过网络招募的男男性行为者也去过实体场所，但不同亚组的到场情况有所不同。参与WHBS和NHBS的参与者存在差异，且WHBS可能代表了一组艾滋病毒感染风险更高的男男性行为者。这些发现表明，基于互联网的方法可能是NHBS的一种有用补充。
