Table 1. Demographic and behavioural characteristics of 511 participants.

	na	Percentage
Age group (years)
18–20	17	3.3
21–25	119	23.3
26–30	127	24.9
31–35	140	27.4
36–40	108	21.1
Ethnicity
White	377	76.2
Black	30	6.1
Asian and SE asian	34	6.9
Mixed/other	51	10.3
Born in the United Kingdom
No	263	53.1
Yes	232	46.9
Sexual orientation
Gay/homosexual	452	91.5
Bisexual	42	8.5
Currently employed
No	105	21.2
Yes	390	78.8
Years of education since the age of 16 years
None	13	2.6
Up to 2 years	58	11.7
3 years or more	340	68.7
Still in education	84	17.0
Circumcised
No	349	71.1
Yes	142	28.9
Alcohol use disorders identification test—AUDIT-C
No-risk drinking	167	34.2
Risk drinking	322	65.9
Currently smokes cigarettes
No	349	70.7
Yes	145	29.4
Age at first receptive anal sex
Up to 15 years	34	7.5
16–20 years	232	51.2
21–25 years	140	30.9
26–39 years	47	10.4
Total lifetime male partners oral and anal
<20	94	19.0
21–30	73	14.8
31–100	168	34.0
101–500	159	32.2
Number of anal sex partners without a condom in the last year (if had anal sex in last year)
No partners without a condom	173	37.4
1	124	26.8
2–4	104	22.5
5–10	40	8.6
11–30	15	3.2
>30	17	1.5
Diagnosed as HIV positive
No	484	94.7
Yes	27	5.3

^aTotal numbers vary for each question because of missing items.