Characteristics of the study population
| Variable | Male | Female |
|---|---|---|
| *Divorced, separated, living together, widowed. | ||
| Age | ||
| Under 20 | 88 (8%) | 253 (23%) |
| 20–24 | 261 (24%) | 332 (30%) |
| 25–30 | 316 (29%) | 258 (23%) |
| Over 30 | 419 (39%) | 271 (24%) |
| Marital status | ||
| Single | 910 (84%) | 944 (85%) |
| Married | 103 (10%) | 85 (8%) |
| Other* | 57 (5%) | 68 (6%) |
| No reply | 14 (1%) | 17 (2%) |
| Ethnic group | ||
| White | 589 (54%) | 659 (59%) |
| Black Caribbean | 367 (34%) | 295 (26%) |
| Other | 113 (10%) | 131 (12%) |
| No reply | 15 (1%) | 29 (3%) |
| Total no of partners (past year) | ||
| None | 67 (6%) | 21 (2%) |
| 1 | 194 (18%) | 423 (38%) |
| 2 | 185 (17%) | 236 (22%) |
| 3 or more | 380 (35%) | 242 (22%) |
| No reply | 258 (24%) | 192 (18%) |
| No of casual partners (past year) | ||
| None | 349 (32%) | 646 (58%) |
| 1 | 215 (20%) | 162 (14%) |
| 2 or more | 237 (22%) | 88 (8%) |
| No reply | 283 (26%) | 218 (20%) |
| Condom use with all partners | ||
| Never | 187 (17%) | 239 (22%) |
| Sometimes | 454 (42%) | 563 (50%) |
| Always | 103 (10%) | 90 (8%) |
| No reply | 340 (31%) | 222 (20%) |
| Condom use with casual partners | ||
| Never | 151 (14%) | 95 (8%) |
| Sometimes | 160 (15%) | 69 (6%) |
| Always | 170 (16%) | 131 (12%) |
| No reply | 603 (56%) | 819 (74%) |
| History of gonorrhoea | ||
| No | 805 (74%) | 802 (72%) |
| Yes | 117 (11%) | 84 (8%) |
| No reply | 162 (15%) | 228 (20%) |
| History of chlamydia | ||
| No | 802 (74%) | 740 (66%) |
| Yes | 118 (11%) | 154 (14%) |
| No reply | 164 (15%) | 220 (20%) |
| History of foreign partner | ||
| No | 831 (77%) | 781 (70%) |
| Yes | 214 (20%) | 226 (20%) |
| No reply | 39 (4%) | 107 (10% |
| No of same sex partners | ||
| None | 758 (70%) | 872 (78%) |
| 1 or more | 68 (6%) | 15 (1%) |
| No reply | 258 (24%) | 227 (20%) |
| Alcohol | ||
| None | 347 (32%) | 344 (31%) |
| 1–5 units/week | 216 (20%) | 425 (38%) |
| >5 units/week | 505 (47%) | 326 (29%) |
| No reply | 16 (2%) | 19 (2%) |
| Smoking | ||
| None | 250 (24%) | 200 (18%) |
| 1–5/day | 464 (44%) | 537 (49%) |
| Over 5/day | 349 (33%) | 364 (33%) |
| No reply | 21 (2%) | 13 (1%) |
| Illicit drug use in past year | ||
| No | 489 (45%) | 648 (58%) |
| Yes | 345 (32%) | 268 (24%) |
| No reply | 250 (23%) | 198 (18%) |
| Occupational group | ||
| Homemaker | 0 (0%) | 108 (10%) |
| Student | 118 (11%) | 232 (21%) |
| Unemployed | 188 (17%) | 121 (11%) |
| Working | 512 (47%) | 439 (39%) |
| No reply | 266 (24%) | 214 (19%) |