Table 1.

Study Sample Characteristics.

Number of participants with 2+ visits	751
Total number of visits	2348
Mean number of visits (range)	3.1 (2-12)
Mean length of follow-up in days (range)	372 (68-1667)
Mean age at first visit (range)	34 (18-73)
Median number of lifetime sexual partners (IQR)	6 (3-12)
Mean age at first sexual intercourse (yrs)	17.5
Ethnicity	%
Caucasian	42.2
Japanese	9.3
Chinese	3.7
Hawaiian/part	14.1
Filipino	5.3
Other or mixed	25.3
Smoking
Current smoker	14.0
Current nonsmoker	86.0
Drinking
Current drinker	55.5
Current nondrinker	44.5
Anal sex practice at baseline
Never	70.6
Past practice	21.4
Current practice	8.0
Condom use at baseline
Current user	33.9
Current non-user	66.1
Oral contraceptive use at baseline
Ever used	79.8
Never used	20.2