TABLE 2.
Menstrual cycle characteristics of female cases and controls
| Cases (%) (n = 119) | Controls (%) (n = 134) | p-value* | |
|---|---|---|---|
| Mean age at menarche (SD) | 12.5 (1.7) | 13.1 (7.6) | 0.44 |
| Menstrual Status | |||
| Pre-menopausal | 35 (29.4) | 46 (34.1) | |
| Peri-menopausal | 5 (4.2) | 3 (2.2) | |
| Post-menopausal | 79 (66.4) | 86 (63.7) | 0.59 |
| Surgical menopause | 42 (53.9) | 33 (41.3) | |
| Natural menopause | 37 (46.1) | 53 (58.7) | |
| Reason for no period in past 12 months | |||
| Menopausal | 37 (45.7) | 47 (56.6) | |
| Surgery | 43 (53.1) | 34 (41.0) | 0.25 |
| Breastfeeding | 0 (0.0) | 1 (1.2) | |
| Other | 1 (1.2) | 0 (0.0) | |
| Median age in years at last period (for post-menopausal women) | 45.0 | 47.0 | 0.46 |
| Women who stated that their menstrual cycle lengths varied by more than 5 days at age 20–29 years | 36 (31.0) | 44 (34.1) | 0.60 |
*
Differences in means were assessed by using t-tests while χ2 tests were done to assess differences in proportions.