Table 3 Major risk factors for HR-HPV infection adjusted for age

Age (years)

0.72

18-29

1230

112 (9.1)

0.75 (0.49-1.15)

30-39

2012

157 (7.8)

1.30 (1.09-1.58)

40-49

1594

112 (7.0)

1 (Ref)

50-65

1100

113 (10.3)

0.58 (0.41-0.81)

Race

The Han nationality

5501

461 (8.4)

1 (Ref)

Minority

155

15 (9.7)

0.566

0.86 (0.50-1.48)

Region

Urban areas

2977

276 (9.3)

0.005

1.31 (1.09-1.58)

Rural areas

2959

218 (7.4)

1 (Ref)

Income per year

<4000¥

2761

209 (7.6)

1 (Ref)

≥4000¥

2781

258 (9.3)

0.013

0.78 (0.65-0.95)

Marital status

Married or in stable relationship

5471

449 (8.2)

<0.0001

0.37 (0.23-0.58)

Unmarried*

159

24 (15.1)

1 (Ref)

Education

Primary/Junior school

4196

344 (8.2)

1 (Ref)

High school/University

1471

132 (9.0)

0.300

0.89 (0.72-1.11)

Smoking

Ever smoked

207

16 ()

0.731

0.91 (0.54-1.53)

Never

5379

450 ()

1 (Ref)

Age at first intercourse

≤17

41

16 (7.8)

1 (Ref)

≥18

5599

459 (8.2)

0.100

1.39 (0.81-2.38)

Age of menarche

≤12

407

34 (8.4)

1 (Ref)

≥13

5257

444 (8.4)

0.961

1.01 (0.70-1.46)

Delivery

≤2

4533

381 (8.4)

1 (Ref)

≥3

702

52 (7.4)

0.372

1.26 (0.92-1.73)

Oral contraceptive pills

Never

5486

456 (8.3)

0.22

1.48 (0.82-1.66)

Ever

110

13 (11.8)

1 (Ref)

Life time sexual partners

1

4924

407 (8.3)

1 (Ref)

≥2

57

6 (10.5)

0.470

0.77 (0.33-1.80)

Husband’s life time sexual partners

1

5114

422 (8.3)

1 (Ref)

≥2

107

14 (13.1)

0.078

1.67 (0.95-2.96)

Menopause

Yes

867

91 (10.5)

1 (Ref)

No

4882

391 (8.0)

0.325

1.23 (0.82-1.83)