Odds ratio (OR) and 95% confidence interval (CI) for dysmenorrhoea in association with self perceived stress during different time phases of the preceding menstrual cycle
| Stress in the follicular phase of the preceding cycles† | Stress in the luteal phase of the preceding cycles† | Total cycles (% dysmenorrhoea) | OR‡§ | 95% CI§ |
|---|---|---|---|---|
| *p<0.05; ***p<0.001. | ||||
| †Exclude cycles with cycle length less than 21 days. | ||||
| ‡The outcome was defined as a binary variable adjusted for age, BMI, shift work, dust exposure, cycle length, education, and passive smoking. | ||||
| §OR, odds ratio; CI, confidence interval. | ||||
| ¶Reference group. | ||||
| Low | Low | 738 (24.5) | 1.0¶ | – |
| Low | Medium/high | 60 (31.7) | 1.4 | 0.8 to 2.5 |
| Medium/high | Low | 42 (42.9) | 2.2 | 1.1 to 4.5* |
| Medium/high | Medium/high | 49 (65.3) | 6.4 | 2.5 to 15.9*** |