Adjusted estimates of the likelihood of a positive test for a sexually transmitted infection by age cohort*
| Characteristic | Total | 18–30 years | 31–44 years | 45–70 years |
|---|---|---|---|---|
| (N=3047) | (N=1523) | (N=1131) | (N=393) | |
| AOR (95% CI)† | AOR (95% CI)† | AOR (95% CI)† | AOR (95% CI)† | |
| Age (years) | ||||
| 18–30 | 0.29 (0.20–0.40) | ‡ | ‡ | ‡ |
| 31–44 | 0.74 (0.55–0.98) | |||
| 45–70 | Referent | |||
| Country of residence | ||||
| Brazil | 3.00 (2.14–4.20) | 7.47 (3.91–14.30) | 1.75 (1.03–2.95) | 2.25 (1.03–4.89) |
| Mexico | 0.55 (0.27–1.14) | 0.71 (0.21–2.41) | 0.36 (0.13–1.03) | 1.09 (0.14–8.31) |
| USA | Referent | Referent | Referent | Referent |
| Race | ||||
| White | Referent | Referent | Referent | Referent |
| Black | 1.50 (1.15–1.96) | 1.07 (0.67–1.72) | 1.64 (1.10–2.42) | 1.48 (0.76–2.87) |
| Asian/Pacific Islander | 0.81 (0.38–1.74) | 0.47 (0.13–1.67) | 1.67 (0.51–5.43) | § |
| American Indian/Alaskan | 0.80 (0.43–1.48) | 0.63 (0.21–1.87) | 1.20 (0.53–2.72) | 0.23 (0.04–1.40) |
| Mixed | 1.30 (0.67–2.50) | 1.67 (0.55–5.09) | 1.24 (0.49–3.10) | 0.65 (0.10–4.33) |
| Marital status | ||||
| Single | 0.93 (0.69–1.25) | 1.00 (0.58–1.73) | 0.96 (0.63–1.47) | 1.73 (0.74–4.08) |
| Married | Referent | Referent | Referent | Referent |
| Cohabitating | 1.06 (0.77–1.46) | 1.15 (0.61–2.19) | 0.93 (0.61–1.43) | 1.34 (0.59–3.07) |
| Divorced/separated/widowed | 1.46 (1.04–2.06) | 1.68 (0.61–4.62) | 1.91 (1.21–3.02) | 0.83 (0.43–1.62) |
| Educational level (years) | ||||
| <12 | 1.62 (1.01–2.59) | 0.53 (0.20–1.38) | 3.04 (1.53–6.06) | 1.03 (0.39–2.72) |
| 12 | 1.25 (0.79–1.96) | 0.44 (0.18–1.07) | 1.85 (0.95–3.59) | 1.33 (0.50–3.55) |
| 13–15 | 1.25 (0.79–1.99) | 0.41 (0.17–1.02) | 2.85 (1.43–5.68) | 1.07 (0.42–2.70) |
| 16 | 1.15 (0.72–1.82) | 0.37 (0.15–0.92) | 1.82 (0.92–3.62) | 0.88 (0.34–2.25) |
| ≥17 | Referent | Referent | Referent | Referent |
| Age at first vaginal sex (years) | ||||
| ≤14 | 2.15 (1.43–3.23) | 1.24 (0.55–2.79) | 2.37 (1.34–4.18) | 3.75 (1.45–9.74) |
| 15–17 | 1.11 (0.76–1.62) | 0.67 (0.31–1.44) | 1.28 (0.76–2.14) | 1.42 (0.60–3.37) |
| 18–20 | 1.28 (0.87–1.89) | 0.81 (0.37–1.79) | 1.80 (1.05–3.07) | 1.08 (0.44–2.68) |
| ≥21 | Referent | Referent | Referent | Referent |
| Ever exchanged sex for money or drugs | ||||
| Yes | 1.35 (1.01–1.80) | 1.01 (0.59–1.72) | 1.18 (0.78–1.78) | 2.30 (1.05–5.04) |
| No | Referent | Referent | Referent | Referent |
| Lifetime female sexual partners (n) | ||||
| 1 | Referent | Referent | Referent | Referent |
| 2–9 | 1.04 (0.75–1.46) | 1.19 (0.67–2.11) | 1.13 (0.68–1.90) | 0.65 (0.29–1.49) |
| 10–19 | 1.02 (0.70–1.49) | 0.77 (0.37–1.60) | 1.14 (0.65–2.00) | 0.80 (0.33–1.90) |
| 20–49 | 1.48 (1.02–2.16) | 2.06 (1.04–4.06) | 1.48 (0.83–2.63) | 0.47 (0.20–1.13) |
| ≥50 | 2.07 (1.31–3.28) | 4.33 (1.74–10.76) | 1.34 (0.68–2.65) | 1.04 (0.38–2.84) |
*Outcome is composite sexually transmitted infection variable: testing positive for genital herpes, chlamydia, gonorrhoea and/or syphilis.
Model is adjusted for the following variables: country of residence, race, ethnicity/Hispanic, marital status, educational level, circumcision status, age at first vaginal sex, previous oral sex and anal sex activity, condom use, and number of lifetime female sexual partners. Ethnicity/Hispanic, circumcision status, previous oral and anal sex activity, and condom use are not included in the table due to lack of significant findings.
†AOR, adjusted odds ratio; 95% CI, 95% confidence interval. Significant values in bold font.
‡Not applicable.
§Insufficient cell size.