Recruitment and Eligibility
From April to August 2007, 21.9 million WHBS recruitment banner ad impressions resulted in 44,801 (0.20%) persons entering the WHBS website and beginning the eligibility screener. Of those, 12,392 (28%) currently resided in one of the 5 WHBS MSAs, of whom 11,979 (97%) were age ≥ 18 years and male at birth. A total of 6,261 (52%) eligible persons completed the interview. For these analyses, 1,081 were excluded because they did not report being male gender or having sex with another man during the past 12 months.
From November 2003 to April 2005, 11,337 persons were approached for NHBS-MSM participation in the 5 MSAs included in this analysis. Eligibility interviews were completed with 9,055 persons (80%), of whom 7,978 (88%) were eligible for participation. Of these, 6,276 (79%) agreed to participate and 5,667 (90%) completed the interview. For these analyses, 951 were excluded because they did not report being male gender or having sex with another man during the past 12 months.
A total of 5,024 WHBS MSM were included in the venue attendance analysis; 156 persons were excluded from this analysis because of missing venue attendance, race/ethnicity or sexual identity information. Ninety-five percent of WHBS MSM reported attending any venue during the past 12 months, and 75% reported attending at least weekly (Table ). Venue attendance in the past 12 months was less likely among those who were non-Hispanic black (compared with other race/ethnicities, aOR=0.5, CI=0.4-0.8, p<0.0001), under the age of 21 (compared with 21 or older, aOR=0.5, CI=0.4-0.7, p<0.0001), not college educated (aOR=0.7, CI=0.5-0.9, p<0.001), bisexual or heterosexual identifying (compared to homosexual, aOR=0.3, CI=0.3-0.4, p<0.0001), and of unknown HIV serostatus (compared with known HIV serostatus, aOR=0.3, CI=0.3-0.4, p<0.0001). Venue attendance in the past 12 months was more likely among MSM who were HIV-positive compared with MSM who were not HIV-positive (aOR=4.3, CI=1.3-13.7, p=0.01).
Frequency of Venue Attendancea by MSM Participant Characteristics During the Past 12 Months, Web-Based HIV Behavioral Surveillance System (2007)
Restaurants, bars, and retail businesses were the 3 most commonly reported venues attended, and more than a third of WHBS MSM attended these locations at least weekly (Table ). Forty-six percent (2120/4584) of NHBS MSM reported using gay or bisexual chat rooms during the past 12 months, and 64% (1354/2120) of those MSM reported using them at least weekly.
Frequency of Venue Attendancea by Venue Type During the Past 12 Months Among MSM Participants, Web-Based HIV Behavioral Surveillance System (2007)
A total of 2,607 NHBS MSM and 2,617 WHBS MSM were included in the comparison analyses. These totals were the result of excluding 2,106 NHBS MSM and 2,407 WHBS MSM because their most recent male sex partner was not a casual sex partner (more than 90% of the exclusions) or there was missing information for race/ethnicity, sexual identity or risk behavior variables (less than 10% of the exclusions). MSM differed significantly between the two studies for all participant characteristics and behaviors examined, except for sexual identity (Table ). Compared to NHBS MSM, a larger proportion of WHBS MSM were non-Hispanic white, under the age of 31, college educated, reported unknown HIV serostatus, engaged in unprotected anal intercourse with their most recent casual male partner, and first met that partner online. Compared to NHBS MSM, a smaller proportion of WHBS MSM were under the influence of drugs during last sex with a casual male partner and did not know the HIV serostatus of that partner.
Characteristics and Behaviors of MSM Participants in the National HIV Behavioral Surveillance System (2003-2005) and the Web-Based HIV Behavioral Surveillance System (2007)
WHBS MSM Meeting Partners Online
Those WHBS MSM who met their most recent casual male sex partner online were more likely than those who met their partner elsewhere to be 21 years or older (aOR=1.3, CI=1.0-1.7, p=0.02), know their own HIV serostatus (aOR=1.3, CI=1.0-1.6, p=0.02), know the HIV serostatus of that sex partner (aOR=1.5, CI=1.3-1.8, p<0.0001), and engage in unprotected anal intercourse with that partner (aOR=1.2, CI=1.0-1.5, p=0.02).