Table 2 Prevalence ratios (PR) for HCV positivity and corresponding 95% confidence intervals (CI) according to selected women’s characteristics

Age

12,164

 <35

6,249

79 (1.3)

1

-

 35-44

2,894

78 (2.7)

1.86

1.39-2.50

 ≥45

3,021

117 (3.9)

2.84

2.18-3.71

  χ ²₁ for trend

p < 0.001

Education level

12,156

 None

1,713

24 (1.4)

1

-

 Primary

1,552

21 (1.3)

0.96

0.52-1.77

 Secondary and higher

8,891

229 (2.6)

0.86

0.46-1.60

Lifetime number of sexual partners^b

10,926

 0

1,086

1 (0.1)

0.21

0.03-1.55

 1

7,513

146 (1.9)

1

-

 2

1,305

60 (4.6)

1.12

0.84-1.49

 3+

1,022

65 (6.4)

1.08

0.81-1.44

χ ²₁ for trend

p = 0.367

Number of births (parity)

11,199

 Nulliparous

2,207

21 (0.9)

1

-

 1

3,228

55 (1.7)

1.68^d

0.98-2.90

 2

2,644

75 (2.8)

1.81^d

1.01-3.26

 3+

3,120

119 (3.8)

1.84^d

1.01-3.38

 χ ²₁ for trend

p = 0.171

Induced abortion^c

9,166

 0

5,433

95 (1.7)

1

-

 1

1,750

46 (2.6)

0.97

0.69-1.37

 2+

1,983

112 (5.6)

1.24

0.93-1.66

 χ ²₁ for trend

p = 0.121

Smoking status

12,153

 Never

10,860

235 (2.2)

1

-

 Ever

1,293

38 (2.9)

1.21

0.88-1.66

HPV DNA-positive

9,984

 No

8,264

183 (2.2)

1

-

 Yes

1,720

65 (3.8)

1.04

0.80-1.36