Table 2.
Logistic regression model of factors related to menstrual irregularity
| Group | B | Standard error | Wald | OR(95%CI) | P |
|---|---|---|---|---|---|
| Age | |||||
| < 25 | 1 | ||||
| 25–30 | 0.651 | 0.38 | 2.94 | 1.12(0.91,4.03) | 0.086 |
| 31–35 | -0.147 | 0.281 | 0.274 | 0.86(0.49,1.49) | 0.601 |
| 36–40 | -0.094 | 0.281 | 0.112 | 0.91(0.53,1.58) | 0.738 |
| >40 | -0.580 | 0.34 | 2.901 | 0.56(0.29,1.09) | 0.089 |
| Household registration | |||||
| rural | 1 | ||||
| urban | -0.110 | 0.187 | 0.346 | 0.89(0.62,1.29) | 0.556 |
| Employment | |||||
| No | 1 | ||||
| Yes | -0.028 | 0.208 | 0.019 | 0.97(0.64,1.46) | 0.892 |
| Household income | |||||
| ≤ 20,000 | 1 | ||||
| 20,000–50,000¥ | -0.022 | 0.234 | 0.009 | 0.97(0.61,1.54) | 0.925 |
| 50,000-100,000¥ | -0.244 | 0.243 | 1.006 | 0.78(0.48,1.26) | 0.316 |
| ≥ 100,000 | -0.448 | 0.303 | 2.19 | 0.63(0.35,1.15) | 0.139 |
| Education | |||||
| Junior high school and below | 1 | ||||
| High school | -0.069 | 0.211 | 0.106 | 0.93(0.61,1.41) | 0.744 |
| university and above | -0.443 | 0.235 | 3.554 | 0.64(0.40,1.01) | 0.059 |
| Number of deliveries | |||||
| 1 | 1 | ||||
| > 1 | -0.184 | 0.182 | 1.016 | 0.83(0.58,1.18) | 0.313 |
| Delivery mode | |||||
| Vaginal delivery | |||||
| Cesarean section | 0.192 | 0.181 | 1.127 | 1.21(0.85,1.72) | 0.288 |
| Pregnancy complications | |||||
| No | 1 | ||||
| Yes | -0.086 | 0.355 | 0.058 | 0.91(0.45,1.84) | 0.809 |
| History of pelvic surgery | |||||
| No | 1 | ||||
| Yes | -0.644 | 0.243 | 7.057 | 0.52(0.32,0.84) | 0.008* |
| BMI | |||||
| normal | 1 | ||||
| underweight | -0.494 | 0.278 | 3.167 | 0.61(0.35,1.05) | 0.075 |
| overweight | 0.086 | 0.221 | 0.151 | 1.08(0.70,1.67) | 0.698 |
| obese | 0.932 | 0.423 | 4.854 | 2.53(1.10,5.81) | 0.028* |
Note: BMI body mass index, B unstandardized regression coefficient, CI confidence interval,*p < 0. 05