Table 2 Prevalence of sexual HIV risk behaviours by data source and adjusted odds ratios (AOR) for the difference in prevalence between data sources: women.
| Early 1990s | Late 1990s | Overall | |||||
|---|---|---|---|---|---|---|---|
| General population Natsal 1990 respondents | HIV+ heterosexuals without risks pre‐1995 | AOR* for difference between sources | General population Natsal 2000 respondents | HIV+ heterosexuals without risks 1995+ | AOR* for difference between sources | AOR† for difference between sources | |
| % (95% CI) | % (95% CI) | (95% CI) | % (95% CI) | % (95% CI) | (95% CI) | (95% CI) | |
| Unweighted N, weighted N | 6580, 5744 | 23, 23 | – | 5293, 4462 | 30, 30 | – | – |
| % reporting first heterosexual intercourse before age 16 | p = 0.031 | p = 0.284 | p = 0.867 | p = 0.776 | p = 0.303 | ||
| 11.4 (10.6 to 12.3) | 26.1 (12.0 to 47.8) | 1.77 (0.62 to 5.07) | 22.0 (20.8 to 23.4) | 23.3 (11.4 to 41.9) | 1.13 (0.49 to 2.58) | 1.40 (0.74 to 2.66) | |
| Age at first heterosexual intercourse: median (Q1, Q3) | 17.5 (16, 19) | 16 (15, 17) | – | 17 (16, 18) | 16 (15.75, 18) | – | – |
| Number of heterosexual partners, past 5 years | p<0.001 | p = 0.002 | p = 0.180 | p = 0.325 | p = 0.004 | ||
| 0 | 1.4 (1.1 to 1.8) | 0 | 3.54 (1.60 to 7.82)‡ | 2.0 (1.7 to 2.4) | 3.3 (0.5 to 20.8) | 1.46 (0.68 to 3.13)‡ | 2.17 (1.28 to 3.66)‡ |
| 1 | 67.0 (65.4 to 68.5) | 21.7 (9.2 to 43.4) | 61.0 (59.4 to 62.6) | 46.7 (29.7 to 64.5) | |||
| 2 | 14.2 (13.2 to 15.3) | 13.0 (4.2 to 34.2) | 14.3 (13.4 to 15.4) | 13.3 (5.0 to 31.0) | |||
| 3–4 | 11.2 (4.5 to 5.8) | 43.5 (24.9 to 64.1) | 12.4 (11.3 to 13.5) | 26.7 (13.8 to 45.3) | |||
| 5–9 | 5.1 (4.5 to 5.8) | 8.7 (2.1 to 29.6) | 7.3 (6.5 to 8.2) | 6.7 (1.6 to 23.5) | |||
| 10+ | 1.1 (0.8 to 1.5) | 13.0 (4.2 to 34.2) | 2.9 (2.4 to 3.5) | 3.3 (0.5 to 20.8) | |||
| Number of heterosexual partners, past 5 years: median (Q1, Q3) | 1 (1, 2) | 3 (2, 4) | – | 1 (1, 2) | 1.5 (1, 3.25) | – | – |
| % reporting heterosexual anal sex, ever | p = 0.340 | p = 0.605 | p = 0.156 | p = 0.249 | p = 0.146 | ||
| 14.5 (13.6 to 15.6) | 21.7 (9.2 to 43.4) | 1.31 (0.47 to 3.63) | 25.2 (23.8 to 26.6) | 36.7 (21.4 to 55.2) | 1.58 (0.73 to 3.41) | 1.56 (0.86 to 2.84) | |
| % reporting never using condoms | p = 0.001 | p = 0.001 | p = 0.003 | p = 0.001 | p<0.001 | ||
| 25.0 (23.7 to 26.4) | 56.5 (35.9 to 75.1) | 4.16 (1.82 to 9.53) | 14.0 (13.0 to 15.2) | 33.3 (18.8 to 52.0) | 3.60 (1.65 to 7.86) | 3.95 (2.30 to 6.80) | |
*OR for being an HIV+ interviewee relative to being a Natsal survey respondent, adjusting for sociodemographics in table 1.
†AOR for being an HIV+ interviewee relative to being a Natsal survey respondent, adjusting for survey's time frame (whether conducted early or late 1990s) and sociodemographics in table 1.
‡Calculated from proportional odds logistic regression.
§Questions on paying for sex were not asked to women in either Natsal survey.