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. 2020 Jun 1;20:824. doi: 10.1186/s12889-020-08952-7

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