Baseline characteristics of the study cohort according to relative body weight and menopausal status
| Premenopausal women | Postmenopausal women | |||||
|---|---|---|---|---|---|---|
| Characteristic | Non-obese* (n=27 712) | Pre-obese† (n=10 715) | Obese‡ (n=4579) | Non-obese* (n=17 818) | Pre-obese† (n=28 184) | Obese‡ (n=4525) |
| BMI, body mass index: *BMI <25.0 kg/m2; †BMI 25.0–30 kg/m2; ‡BMI >30.0 kg/m2. p values for trend (χ2 two sided) were <0.05 for all covariates listed. | ||||||
| Person years | 298 239 | 113 659 | 48 060 | 189 156 | 108 003 | 46 649 |
| Median BMI (kg/m2) | 22.3 | 26.7 | 33.0 | 22.3 | 26.8 | 32.7 |
| Mean age at baseline (y) | 44.3 | 45.0 | 45.0 | 53.1 | 53.8 | 53.6 |
| Smoking (% current smokers) | 22.6 | 20.0 | 20.1 | 24.7 | 20.5 | 18.1 |
| Education (% post-secondary) | 35.5 | 28.7 | 22.9 | 25.4 | 20.7 | 16.4 |
| Oral contraceptive use (%) | 71.6 | 66.5 | 62.7 | 47.9 | 41.5 | 37.9 |
| HRT (%) | 6.4 | 7.1 | 7.5 | 48.7 | 47.2 | 39.5 |
| Parity (mean No of children) | 2.2 | 2.5 | 2.6 | 2.5 | 2.8 | 3.0 |