Self-reported menstrual cycle characteristics of women with and without type 1 diabetes by age range
| Type 1 diabetes | Without diabetes | P | |||
|---|---|---|---|---|---|
| Sisters | Control subjects | ||||
| <20 years of age (n) | 143 | 186 | 158 | ||
| Bleeding ≥6 days | 56.5 | 41.6 | 47.7 | 0.04 | |
| Cycles >31 days | 24.8 | 14.3 | 17.8 | 0.07 | |
| Heavy bleeding | 25.2 | 18.1 | 22.4 | 0.31 | |
| Any irregularity | 78.7 | 64.3 | 66.7 | 0.02 | |
| 20–29 years of age (n) | 143 | 186 | 158 | ||
| Bleeding ≥6 days | 52.8 | 38.7 | 40.5 | 0.04 | |
| Cycles >31 days | 22.1 | 8.0 | 12.3 | 0.002 | |
| Heavy bleeding | 27.0 | 14.7 | 21.0 | 0.03 | |
| Any irregularity | 76.8 | 55.4 | 55.5 | <0.001 | |
| 30–39 years of age (n) | 141 | 180 | 152 | ||
| Bleeding ≥6 days | 44.8 | 41.1 | 36.2 | 0.36 | |
| Cycles >31 days | 11.9 | 8.4 | 8.3 | 0.53 | |
| Heavy bleeding | 25.0 | 18.6 | 25.2 | 0.29 | |
| Any irregularity | 67.5 | 57.9 | 53.8 | 0.08 | |
| 40–49 years of age (n) | 100 | 114 | 91 | ||
| Bleeding ≥6 days | 40.8 | 36.0 | 29.0 | 0.34 | |
| Cycles >31 days | 8.6 | 11.1 | 10.4 | 0.87 | |
| Heavy bleeding | 21.6 | 27.5 | 29.2 | 0.55 | |
| Any irregularity | 67.6 | 67.4 | 62.1 | 0.74 | |
Data are %.