| Total subjects | Eastern/central subjects | Western subjects | |||
---|---|---|---|---|---|---|
 | OR | 95% CI for OR | OR | 95% CI for OR | OR | 95% CI for OR |
Age in years | 1.25* | 1.20~1.30 | 1.28* | 1.23~1.35 | 1.17* | 1.12~1.22 |
Education (Senior high or higher vs. Junior high or lower) | 1.41* | 1.20~1.66 | 1.48* | 1.25~176 | 1.36* | 1.14~1.48 |
Current residential type (Rental vs. Dormitory) | 4.83* | 3.84~6.07 | 5.38* | 4.19~6.92 | 3.05* | 1.65~5.65 |
Dating (yes vs. no) | 3.69* | 3.05~4.46 | 3.73* | 3.05~4.58 | 4.21* | 2.45~7.21 |
Sexual-related knowledge | 1.08* | 1.06~1.10 | 1.05* | 1.02~1.07 | 1.26* | 1.19~1.33 |
Attitudes towards premarital sex (Unfavorable as reference) | Â | Â | Â | Â | Â | Â |
   neutral | 0.627* | 0.49~0.80 | 0.50* | 0.389~0.65 | 1.09 | 0.54~2.19 |
   favorable | 2.57* | 1.93~3.43 | 2.14* | 11.57~2.92 | 2.45* | 1.03~5.79 |
Communicated with a boyfriend about sex-related issues(yes vs. no) | 1.68* | 1.34~2.09 | 1.78* | 1.40~2.26 | 1.50 | 0.60~3.75 |
Constant | -9.01 | Â | -8.98 | Â | -6.64 | Â |