Table 2.
Univariate logistic regression between infertility and WHR and other risk factors
| Variables | OR (95% CI) | p value |
|---|---|---|
| Age, years | 1.02 (1.00–1.05) | 0.069 |
| Race and ethnicity | ||
| Non-Hispanic white | 1.00 (ref) | |
| Non-Hispanic black | 0.55 (0.33–0.92) | 0.022 |
| Mexican American | 0.75 (0.42–1.36) | 0.350 |
| Others | 0.81 (0.49–1.34) | 0.402 |
| Education level | ||
| <9 years | 1.00 (ref) | |
| 9–12 years | 1.15 (0.43–3.05) | 0.786 |
| >12 years | 1.11 (0.42–2.90) | 0.834 |
| Marital status | ||
| Married or living with a partner | 1.00 (ref) | |
| Living alone | 0.49 (0.33–0.74) | 0.001 |
| PIR | ||
| ≤1.3 | 1.00 (ref) | |
| >1.3 | 1.54 (1.04–2.27) | 0.033 |
| Dietary supplements taken | 0.91 (0.61–1.34) | 0.620 |
| BMI, kg/m2 | 1.03 (1.00–1.05) | 0.016 |
| Hypertension | 0.96 (0.51–1.82) | 0.911 |
| Diabetes | 2.77 (1.39–5.52) | 0.004 |
| Physical activity | ||
| Sedentary | 1.00 (ref) | |
| Moderate | 0.64 (0.39–1.03) | 0.068 |
| Vigorous | 0.82 (0.51–1.30) | 0.389 |
| Smoking status | ||
| Never | 1.00 (ref) | |
| Former | 1.48 (0.84–2.60) | 0.171 |
| Current | 1.9 (1.22–2.96) | 0.005 |
| Alcohol drinker | 1.44 (0.71–2.94) | 0.317 |
| PID | ||
| No | 1.00 (ref) | |
| Yes | 1.38 (0.70–2.71) | 0.347 |
| Regular menstrual periods | ||
| No | 1.00 (ref) | |
| Yes | 0.85 (0.41–1.77) | 0.670 |
| Trouble sleeping | ||
| No | 1.00 (ref) | |
| Yes | 1.74 (1.15–2.64) | 0.008 |
| WHRa | 1.51 (1.17–1.97) | 0.002 |
Data presented are OR and 95% CI.
WHR, waist-hip ratio; BMl, body mass index; PIR, family poverty income ratio; PID, pelvic inflammatory disease; OR, odds ratio; 95% CI, 95% confidence interval.
aThe OR was examined by per 0.1-unit increase of WHR.