Table 2 Multivariate analysis of factors associated with syphilis infection

Age group in years

16-19

1.0 (Reference)

-

20-29

2.62 (1.57, 4.36)

< 0.001

30-39

4.37 (2.57, 7.42)

< 0.001

40-

7.81 (4.36, 14.01)

< 0.001

Site city

Yangzhou

1.0 (Reference)

-

Changzhou

14.35 (6.43, 32.03)

< 0.001

Jiangmen

9.51 (3.76, 24.08)

< 0.001

Maoming

10.62 (4.61, 24.47)

< 0.001

Wuzhou

4.17 (1.90, 9.17)

< 0.001

Hezhou

13.54 (6.17, 29.71)

< 0.001

Qionghai

9.44 (4.00, 22.29)

< 0.001

Sanya

8.14 (3.48, 19.02)

< 0.001

Education

Primary or less

2.10 (1.34, 3.30)

0.001

Junior high school

1.56 (1.04, 2.35)

0.031

Senior high school and above

1.0 (Reference)

-

Typology

High-tier

1.0 (Reference)

-

Middle-tier

1.68 (1.15, 2.46)

0.008

Low-tier

4.05 (2.60, 6.31)

< 0.001

Injecting drug use

Yes

6.17 (2.13, 17.81)

0.001

No

1.0 (Reference)

-