Table 2

 Trends in behavioural and biological measures of HIV risk, men who have sex with men, San Francisco, 1998 to 2004

SourceMeasure1998199920002001200220032004
UAI, unprotected anal intercourse, MSM, men who have sex with men.
Anonymous HIV testing sites (n = 20 589)HIV incidence (% per year)1.14.12.92.82.81.73.2
Any UAI with known HIV+ partner (%)14.516.015.49.37.19.59.7
Receptive UAI with known HIV+ partner (%)8.19.38.74.53.44.04.3
Insertive UAI with known HIV+ partner (%)13.013.913.98.16.48.18.2
STI clinic HIV testing programme (n = 8821)HIV incidence (% per year)4.64.83.33.44.44.23.6
Any UAI with known HIV+ partner (%)18.89.39.012.013.113.86.2
Receptive UAI with known HIV+ partner (%)15.35.86.37.88.48.12.5
Insertive UAI with known HIV+ partner (%)17.98.78.410.811.812.55.3
STOP AIDS Project (n = 16 331)Any UAI, all MSM (%)30.832.335.937.833.038.634.6
UAI with partners of unknown HIV serostatus, HIV+ MSM (%)21.625.325.630.727.52821
UAI with partners of unknown serostatus, HIV- MSM (%)11.914.817.120.215.78.04.0
STI surveillanceEarly syphilis cases (n)93252155438475492
Male rectal gonorrhoea cases (n)157163202211284290389