Table 3.
Univariate and multivariate analyses of factors associated with syphilis infection
| Variables | No. | Cases (%) | cOR (95% CI) | aOR (95% CI) |
|---|---|---|---|---|
| Town | ||||
| A | 524 | 9 (1.7) | Ref. | |
| B | 571 | 7 (1.2) | 0.71 (0.25–1.96) | |
| C | 968 | 12 (1.2) | 0.72 (0.30–1.78) | |
| D | 545 | 4 (0.7) | 0.43 (0.11–1.36) | |
| Sex | ||||
| Female | 1700 | 22 (1.3) | Ref. | |
| Male | 908 | 10 (1.1) | 0.86 (0.38–1.78) | |
| Age group (years) | ||||
| 14–24 | 413 | 3 (0.7) | Ref. | |
| 25–34 | 592 | 9 (1.5) | 2.04 (0.59–9.71) | |
| 35–44 | 772 | 14 (1.8) | 2.42 (0.78–11.03) | |
| 45–54 | 558 | 4 (0.7) | 0.97 (0.20–5.32) | |
| ≥ 55 | 273 | 2 (0.7) | 1.03 (0.12–6.82) | |
| Ethnicity | ||||
| Yi | 2519 | 32 (1.3) | ||
| Han and others | 89 | 0 (0.00) | ||
| Education | ||||
| Illiteracy | 1676 | 25 (1.5) | Ref. | |
| Primary school | 655 | 4 (0.6) | 0.42 (0.12–1.09) | |
| High school and above | 277 | 3 (1.1) | 0.76 (0.17–2.19) | |
| Occupation | ||||
| Students | 150 | 0 (0.00) | – | |
| Farmers | 2382 | 31 (1.3) | 0.70(0.09–5.24) | |
| Others | 54 | 1 (1.9) | Ref. | |
| Ever working away from home | ||||
| No | 442 | 5 (1.1) | Ref. | |
| Yes | 2166 | 27 (1.2) | 1.08 (0.45–3.24) | |
| Annual income | ||||
| < 1000 | 407 | 2 (0.5) | Ref. | |
| 1000–2999 | 922 | 13 (1.4) | 2.72 (0.74–19.00) | |
| 3000–4999 | 603 | 9 (1.5) | 2.90 (0.73–20.91) | |
| 5000–9999 | 321 | 5 (1.6) | 3.06 (0.63–23.93) | |
| ≥ 10,000 | 331 | 3 (0.9) | 1.81 (0.27–15.64) | |
| Marital status | ||||
| Ever married | 2181 | 31 (1.4) | Ref. | |
| Never married | 427 | 1 (0.2) | 6.14(0.84–45.12) | |
| Spouse syphilis | ||||
| No or unknown | 2601 | 30 (1.2) | Ref. | Ref. |
| Yes | 7 | 2 (28.6) | 35.39 (4.42–180.06) ** | 38.51 (7.12–208.16) ** |
| Ever using injection drugs | ||||
| No | 2519 | 28 (1.1) | Ref. | Ref. |
| Yes | 89 | 4 (4.5) | 4.32 (1.23–11.39) * | 3.48 (1.14–10.57) * |
| Having multiple sexual partners | ||||
| No | 2181 | 22 (1.0) | Ref. | |
| Yes | 427 | 10 (2.3) | 2.37 (1.06–4.95) * | |
| Condom use | ||||
| Always or occasionally | 562 | 12 (2.1) | Ref. | |
| Never | 1442 | 14 (1.0) | 0.45 (0.20–1.00) * | |
| Ever having blood transfusion | ||||
| No or unknown | 2580 | 30 (1.2) | Ref. | Ref. |
| Yes | 28 | 2 (7.1) | 6.96 (1.00–24.98) * | 5.70 (1.12–28.97) * |
| HIV infection | ||||
| No | 2463 | 28 (1.1) | Ref. | |
| Yes | 145 | 4 (2.8) | 2.55 (0.73–6.64) | |
| HBV infection | ||||
| No | 2412 | 26 (1.1) | Ref. | Ref. |
| Yes | 194 | 6 (3.1) | 2.99 (1.09–6.92) * | 2.76 (1.00–6.46) * |
| HCV infection | ||||
| No | 2485 | 26 (1.0) | Ref. | Ref. |
| Yes | 71 | 6 (8.5) | 8.87 (3.17–21.11) ** | 8.34 (3.01–19.84) ** |
*P < 0.05, **P < 0.01