Table 1.
Characteristics compared between women with and without primary dysmenorrhea.
| Variable | Non-Dysmenorrhea Cohort (n = 36,910) |
Dysmenorrhea Cohort (n = 18,455) |
p Value * | ||
|---|---|---|---|---|---|
| n | % | n | % | ||
| Age group (years) | 0.99 | ||||
| 15–29 | 27,666 | 75.0 | 13,833 | 75.0 | |
| 30–39 | 6634 | 18.0 | 3317 | 18.0 | |
| 40–50 | 2610 | 7.07 | 1305 | 7.07 | |
| Mean age, years (SD) | 25.7 | (8.03) | 25.6 | (7.90) | 0.27 |
| Baseline comorbidities | |||||
| Diabetes | 450 | 1.22 | 233 | 1.26 | 0.66 |
| Hypertension | 494 | 1.34 | 253 | 1.37 | 0.75 |
| Hyperlipidemia | 416 | 1.13 | 299 | 1.62 | <0.0001 |
| Arrhythmia | 500 | 1.35 | 433 | 2.35 | <0.0001 |
| Thyroid disease | 1545 | 4.19 | 1068 | 5.79 | <0.0001 |
| Migraine | 610 | 1.65 | 689 | 3.73 | <0.0001 |
| Medicine use | |||||
| NSAID | 180 | 0.49 | 132 | 0.72 | 0.0007 |
| Female hormone use | 32 | 0.09 | 16 | 0.09 | 0.99 |
| Follow-up year, mean (SD) | 9.77 | (2.61) | 9.47 | (2.62) | <0.0001 |
* Chi-square test, and a t-test. SD, standard deviation. The median follow-up period was 9.83 years and 9.52 years for the dysmenorrhea cohort and comparison cohort, respectively.