Table 1 Sample characteristics by gender in Beijing, China in 2010-2011

15-18

10.73

5.73

≥19

40.27

43.27

Educational level (N=1,186)

9.4684

0.002***

Postgraduate

4.72

7.50

Undergraduate

45.87

41.91

Accessible knowledge sources, median (IQR)

3(2)

3(2)

Expected knowledge categories, median (IQR)

3(3)

4(3)

Expected knowledge sources, median (IQR)

3(2)

3(2)

Knowledge of emergency contraception (N=1,176)

13.3200

0.000***

No

22.19

15.99

Yes

29.17

32.65

Knowledge of safety period (N=1,169)

6.2467

0.012**

No

41.23

35.59

Yes

10.44

12.75

Knowledge of condom use (N=1,175)

134.7675

0.000***

No

36.17

17.87

Yes

15.15

30.81

Unmarried sex (N=1,187)

32.9291

0.000***

Agreement

11.79

5.31

Disagreement

38.84

44.06

Unmarried pregnancy (N=1,186)

22.8226

0.000***

Agreement

22.43

15.26

Disagreement

28.16

34.15

Unmarried cohabitation (N=1,184)

47.3392

0.000***

Agreement

34.80

42.06

Disagreement

15.96

7.18

Sexual behaviour (N=1175)

72.2138

0.000***

No

47.91

37.87

Yes

2.89

11.32