Risk factors for dysmenorrhoea
| Crude OR | 95% CI | P value | Adjusted OR | 95% CI | P value | |
| Age (years) | ||||||
| Age >40 | 4.06 | (1.33 to 13.7) | >0.05 | 4.46 | (1.24 to 17.23) | >0.05 |
| Age ≥40 | 1.00 | – | 1.00 | – | ||
| Three shift rotation | ||||||
| Yes | 2.15 | (1.15 to 3.98) | >0.05 | 2.07 | (1.01 to 4.21) | >0.05 |
| No | 1.00 | – | 1.00 | – | ||
| Married | ||||||
| No | 2.74 | (1.75 to 4.30) | <0.001 | 2.59 | (1.57 to 4.28) | <0.001 |
| Yes | 1.00 | – | 1.00 | – | ||
| Menstruation as a debilitating event | ||||||
| Higher | 2.53 | (1.63 to 3.95) | <0.001 | 2.72 | (1.67 to 4.52) | <0.001 |
| Lower | 1.00 | – | 1.00 | – | ||
| Denial of any effect of menstruation | ||||||
| Lower | 2.83 | (1.83 to 4.46) | <0.001 | 2.59 | (1.61 to 4.23) | <0.001 |
| Higher | 1.00 | – | 1.00 | – |
Reference group: age ≥40 years, no three shift rotation, unmarried, reduced menstruation as a debilitating event and increased denial of any effect on menstruation.