Factor (reference) | Levels | Estimate | Standard error | Wald Chi-square | P value | OR (95% CI) |
---|---|---|---|---|---|---|
Age |  < 45 |  |  |  |  | 1.00 (Ref.) |
 | 45–50 | 0.2897 | 0.0543 | 28.5085 |  < 0.0001 | 1.34 (1.20–1.49) |
 |  ≥ 50 | 0.6419 | 0.0685 | 87.7373 |  < 0.0001 | 1.90 (1.66–2.17) |
BMI |  | 0.0264 | 0.00824 | 10.2513 | 0.0014 | 1.03 (1.01–1.04) |
Marital status | Married | Â | Â | Â | Â | 1.00 (Ref.) |
 | Others | 0.3852 | 0.1183 | 10.5943 | 0.0011 | 1.47 (1.17–1.85) |
Occupation | Clerical or professional | Â | Â | Â | Â | 1.00 (Ref.) |
 | Farmer or manual | 0.0813 | 0.0718 | 1.2831 | 0.2573 | 1.08 (0.94–1.25) |
 | Others | 0.00385 | 0.0729 | 0.0028 | 0.9578 | 1.00 (0.87–1.16) |
Family income |  < 1800 $ |  |  |  |  | 1.00 (Ref.) |
 | 1800–3600 $ |  − 0.0651 | 0.0562 | 1.3416 | 0.2468 | 0.94 (0.84–1.05) |
 |  > 3600 $ | − 0.1035 | 0.0590 | 3.0785 | 0.0793 | 0.90 (0.80–1.01) |
Education | Illiterate or elementary school | Â | Â | Â | Â | 1.00 (Ref.) |
 | Middle school | − 0.3388 | 0.0618 | 30.0884 |  < 0.0001 | 0.71 (0.63–0.80) |
 | High school | − 0.5871 | 0.0775 | 57.3372 |  < 0.0001 | 0.56 (0.48–0.65) |
 | College and above | − 0.8246 | 0.0901 | 83.7898 |  < 0.0001 | 0.44 (0.37–0.52) |
Physical activity | Never | Â | Â | Â | Â | 1.00 (Ref.) |
 | 1–3 times/week | 0.1227 | 0.0836 | 2.1531 | 0.1423 | 1.13 (0.96–1.33) |
 | 4–6 times/week | 0.1773 | 0.0823 | 4.6377 | 0.0313 | 1.19 (1.02–1.40) |
 |  ≥ 7 times/week | − 0.1533 | 0.0645 | 5.6500 | 0.0175 | 0.86 (0.76–0.97) |
Age at menarche |  < 15 years |  |  |  |  | 1.00 (Ref.) |
 |  ≥ 15 years | 0.00505 | 0.0471 | 0.0115 | 0.9146 | 1.01 (0.92–1.10) |
Duration of Menstruation |  < 5 days |  |  |  |  | 1.00 (Ref.) |
 | 5–6 days | 0.0201 | 0.0496 | 0.1636 | 0.6858 | 1.02 (0.93–1.12) |
 |  ≥ 7 days | 0.1768 | 0.0606 | 8.5210 | 0.0035 | 1.19 (1.06–1.34) |
Interval of Menstruation |  ≤ 28 days |  |  |  |  | 1.00 (Ref.) |
 |  > 28 days | 0.0153 | 0.0450 | 0.1160 | 0.7335 | 1.02 (0.93–1.11) |
Pregnancy time | 0–1 |  |  |  |  | 1.00 (Ref.) |
 | 2–3 | 0.1689 | 0.0670 | 6.3618 | 0.0117 | 1.18 (1.04–1.35) |
 |  > 3 | 0.3814 | 0.0834 | 20.9303 |  < 0.0001 | 1.46 (1.24–1.72) |
Duration of breastfeeding |  < 12 months |  |  |  |  | 1.00 (Ref.) |
 | 12 months | 0.000538 | 0.0553 | 0.0001 | 0.9922 | 1.00 (0.90–1.12) |
 |  > 12 months | 0.1316 | 0.0574 | 5.2595 | 0.0218 | 1.14 (1.02–1.28) |
Menopausal status | Premenopause | Â | Â | Â | Â | 1.00 (Ref.) |
 | Perimenopause | 0.7530 | 0.0563 | 178.7927 |  < 0.0001 | 2.12 (1.90–2.37) |
 | Postmenopause | 0.9270 | 0.0662 | 196.0497 |  < 0.0001 | 2.53 (2.22–2.88) |
Gynecological disease |  | − 0.3821 | 0.0470 | 66.0550 |  < 0.0001 | 0.68 (0.62–0.75) |
Breast disease |  | − 0.2354 | 0.0534 | 19.4351 |  < 0.0001 | 0.79 (0.71–0.88) |
Chronic disease |  | − 0.6737 | 0.0665 | 102.5331 |  < 0.0001 | 0.51 (0.45–0.58) |
MHT (yes) |  | 0.3312 | 0.0964 | 11.8077 | 0.0006 | 1.39 (1.15–1.68) |