Table 2. Characteristics of cases and controls.
| Characteristic | Number of cases (%) | Number of controls (%) |
|---|---|---|
| Age (years) | ||
| 20–44 | 12 (3.0%) | 11 (2.8%) |
| 45–49 | 16 (4.0%) | 19 (4.8%) |
| 50–54 | 52 (13.0%) | 58 (14.5%) |
| 55–59 | 87 (21.8%) | 79 (19.8%) |
| 60–64 | 91 (22.8%) | 100 (25.1%) |
| 65–69 | 93 (23.3%) | 83 (20.8%) |
| 70+ | 48 (12.0%) | 49 (12.3%) |
| Number of children | ||
| None | 56 (14.0%) | 55 (13.8%) |
| 1 | 55 (13.8%) | 45 (11.3%) |
| 2 | 132 (33.1%) | 124 (31.1%) |
| 3 | 103 (25.8%) | 92 (23.1%) |
| 4 | 39 (9.8%) | 46 (11.5%) |
| 5+ | 14 (3.5%) | 37 (9.3%) |
| Age at first child (for parous women only) (years) a | ||
| 0–20 | 73 (21.3%) | 78 (22.7%) |
| 21–22 | 72 (21.0%) | 64 (18.6%) |
| 23–24 | 55 (16.0%) | 73 (21.2%) |
| 25–27 | 68 (19.8%) | 73 (21.1%) |
| 28+ | 75 (21.9%) | 56 (16.3%) |
| BMI b | ||
| ⩽22 | 88 (30.4%) | 82 (29.0%) |
| 21.1–24 | 70 (24.2%) | 64 (22.6%) |
| 24.1–26 | 49 (17.0%) | 59 (20.8%) |
| >26 | 82 (28.4%) | 78 (27.6%) |
Abbreviation: BMI=body mass index.
a
Restricted to 343 cases and 344 controls with at least one live birth.
b
Restricted to 289 cases and 283 controls with measurements of BMI.