| STI* clinic attendees (n = 145) | Population-based controls (n = 956) |  | ||
---|---|---|---|---|---|
Characteristic | n | % | n | % | pvalue†|
Age at first sexual intercourse (years) | Â | Â | Â | Â | <0.001 |
   <19 | 105 | 72.4 | 244 | 25.5 |  |
   19 or older | 38 | 26.2 | 641 | 67.1 |  |
   Missing | 2 | 1.4 | 71 | 7.4 |  |
   Mean(SD*) | 17.6(2.7) |  | 20.5(3.3) |  |  |
   Median | 17 |  | 20 |  |  |
No. of partners (previous year) | Â | Â | Â | Â | <0.001 |
   1 | 56 | 38.6 | 871 | 91.1 |  |
   2 or 3 | 33 | 22.8 | 65 | 6.8 |  |
   4 or more | 30 | 20.7 | 12 | 1.3 |  |
   Missing | 26 | 17.9 | 8 | 0.8 |  |
Type of sex partner (previous year) | Â | Â | Â | Â | Â |
   Regular partner |  |  |  |  | 0.011 |
Yes | 139 | 95.9 | 942 | 98.5 | Â |
No | 6 | 4.1 | 10 | 1.0 | Â |
Missing | 0 | 0 | 4 | 0.4 | Â |
   Casual Partner |  |  |  |  | <0.001 |
Yes | 58 | 40.0 | 35 | 3.7 | Â |
No | 86 | 59.3 | 908 | 95.0 | Â |
Missing | 1 | 0.7 | 13 | 1.4 | Â |
Sex with regular partners (previous year) | Â | Â | Â | Â | Â |
   Had unprotected vaginal sex |  |  |  |  |  |
Yes | 119 | 82.1 | 622 | 65.1 | <0.001 |
No | 17 | 11.7 | 268 | 28.0 | Â |
Missing | 9 | 6.2 | 66 | 6.9 | Â |
   Had unprotected oral sex |  |  |  |  |  |
Yes | 122 | 84.1 | 524 | 54.8 | <0.001 |
No | 18 | 12.4 | 375 | 39.2 | Â |
Missing | 5 | 3.4 | 57 | 6.0 | Â |
   Had unprotected anal sex |  |  |  |  |  |
Yes | 10 | 6.9 | 42 | 4.4 | 0.31 |
No | 130 | 89.7 | 851 | 89.0 | Â |
Missing | 5 | 3.4 | 63 | 6.6 | Â |
Sex with casual partners (previous year) | Â | Â | Â | Â | Â |
   Had unprotected vaginal sex |  |  |  |  |  |
Yes | 44 | 30.3 | 20 | 2.1 | <0.001 |
No | 94 | 64.8 | 922 | 96.4 | Â |
Missing | 7 | 4.8 | 14 | 1.5 | Â |
   Had unprotected oral sex |  |  |  |  |  |
Yes | 40 | 27.6 | 17 | 1.8 | <0.001 |
No | 97 | 66.9 | 925 | 96.8 | Â |
Missing | 8 | 5.5 | 14 | 1.5 | Â |
   Had unprotected anal sex |  |  |  |  |  |
Yes | 0 | 0 | 1 | 0.1 | 1.00 |
No | 138 | 95.2 | 941 | 98.4 | Â |
Missing | 7 | 4.8 | 14 | 1.5 | Â |