This study investigated HIV and syphilis incidence among men
who have sex with men (MSM) in Beijing, China.
An open cohort was established from September 2009 to April
2012. Participants were followed up with every three to four months after
recruitment and for thirty-one months in total. Chi-square tests were used to
compare demographic and behavioral characteristics between participants who
were followed up with and those lost to follow up. Univariate and multivariate
Cox proportional hazards regression analyses were used to examine demographic
and behavioral associations with HIV and syphilis incidence.
69.7% (699/1,003) of the participants finished at least two
follow-up surveys during the study period. Variables which corresponded to
increased loss to follow-up included younger age, less education,
non-identification of homosexual identity, and migrant status. A total of 1,045
person-years (PYs) and 1,016.4 PYs were followed up for HIV and syphilis
incidence estimation, respectively. The HIV incidence was 5.9 per 100 PYs and
7.8 per 100 PYs for syphilis. The predictors for the high HIV incidence
included unsafe anal sex, sex after drinking alcohol and STI infection.
HIV incidence increased rapidly within the cohort, but
syphilis incidence remained stable and decreased. More research is needed to
provide multi-pronged HIV prevention interventions among MSM in order to reduce
the increasing burden of HIV and sexually transmitted infections (STIs) in
China.
Below: Recruitment Tree of the first round of enrollment using the respondent-driven sampling (RDS) method
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