Table 3 Univariate and multivariate analyses of factors associated with syphilis infection

 A

Ref.

 B

0.71 (0.25–1.96)

 C

0.72 (0.30–1.78)

 D

0.43 (0.11–1.36)

 Female

Ref.

 Male

0.86 (0.38–1.78)

 14–24

Ref.

 25–34

2.04 (0.59–9.71)

 35–44

2.42 (0.78–11.03)

 45–54

0.97 (0.20–5.32)

  ≥ 55

1.03 (0.12–6.82)

 Yi

 Han and others

 Illiteracy

Ref.

 Primary school

0.42 (0.12–1.09)

 High school and above

0.76 (0.17–2.19)

 Students

–

 Farmers

0.70(0.09–5.24)

 Others

Ref.

 No

Ref.

 Yes

1.08 (0.45–3.24)

 < 1000

Ref.

 1000–2999

2.72 (0.74–19.00)

 3000–4999

2.90 (0.73–20.91)

 5000–9999

3.06 (0.63–23.93)

 ≥ 10,000

1.81 (0.27–15.64)

 Ever married

Ref.

 Never married

6.14(0.84–45.12)

 No or unknown

Ref.

Ref.

 Yes

35.39 (4.42–180.06) ^**

38.51 (7.12–208.16) ^**

 No

Ref.

Ref.

 Yes

4.32 (1.23–11.39) ^*

3.48 (1.14–10.57) ^*

 No

Ref.

 Yes

2.37 (1.06–4.95) ^*

 Always or occasionally

Ref.

 Never

0.45 (0.20–1.00) ^*

 No or unknown

Ref.

Ref.

 Yes

6.96 (1.00–24.98) ^*

5.70 (1.12–28.97) ^*

 No

Ref.

 Yes

2.55 (0.73–6.64)

 No

Ref.

Ref.

 Yes

2.99 (1.09–6.92) ^*

2.76 (1.00–6.46) ^*

 No

Ref.

Ref.

 Yes

8.87 (3.17–21.11) ^**

8.34 (3.01–19.84) ^**