Table 1.

Distribution of participants for sexual risk index scores and mean and median scores, by age

Age	No. of participants	Mean score (SD), range 0–4	Median
14	57	0.19 (0.58)	0
15	790	0.32 (0.80)	0
16	1565	0.53 (0.95)	0
17	2339	0.78 (1.07)	0
18	2714	0.99 (1.14)	1
19	2982	1.15 (1.17)	1
20	2503	1.21 (1.18)	1
21	2080	1.22 (1.22)	1
22	1870	1.23 (1.20)	1
23	1966	1.34 (1.18)	1
24	1613	1.46 (1.17)	2
25	1364	1.57 (1.17)	2
26	1023	1.68 (1.09)	2
27	448	1.50 (1.07)	2

Sexual risk index is defined as: 0= abstinent, 1= always uses a condom, 2= monogamous and has unprotected sex, 3= non-monogamous and has unprotected sex sometimes and 4= non-monogamous and always has unprotected sex. Questions refer to practices since the date of last interview (or past year for baseline) and refer specifically to experiences with individuals of the opposite sex.