Baseline characteristics of participants
| Characteristics (mean/%, 95% CI) | Age at natural menopause | |||
| 40–48 years n=226 | 49–51 years n=319 | ≥52 years n=369 | Total n=914 | |
| Age at baseline (years) | 45.4 (45.0 to 45.8) | 49.0 (48.8 to 49.2) | 52.1 (51.9 to 52.4) | 49.4 (49.2 to 49.6) |
| Birth year (years) | 1950 (1950 to 1951) | 1947 (1946 to 1947) | 1944 (1943 to 1944) | 1946 (1946 to 1946) |
| Body mass index (kg/m²) | 23.6 (23.0 to 24.1) | 23.5 (23.1 to 23.9) | 24.3 (23.8 to 24.7) | 23.8 (23.6 to 24.1) |
| Obese>30 kg/m² (%) | 8.4 (5.4 to 12.8) | 6.9 (4.6 to 10.3) | 12.6 (9.5 to 16.4) | 9.6 (7.8 to 11.7) |
| Physical activity (min/day) | 12.8 (10.2 to 15.4) | 16.5 (13.6 to 19.4) | 14.1 (11.8 to 16.3) | 14.6 (13.1 to 16.1) |
| Vegetarian (%) | 45.7 (39.2 to 52.4) | 44.2 (38.8 to 49.8) | 33.0 (28.3 to 38.0) | 40.0 (36.9 to 43.3) |
| Alcohol consumption (g/day) | 10.1 (8.4 to 11.8) | 8.6 (7.5 to 9.7) | 8.4 (7.4 to 9.4) | 9.0 (8.2 to 9.6) |
| Smoking (%) | 10.2 (6.9 to 14.9) | 8.0 (5.4 to 11.5) | 5.0 (3.1 to 7.7) | 7.3 (5.8 to 9.2) |
| Age at menarche (years) | 12.6 (12.4 to 12.8) | 12.7 (12.5 to 12.8) | 12.9 (12.7 to 13.1) | 12.7 (12.6 to 12.8) |
| Age at first full-term pregnancy (years) | 26.6 (25.8 to 27.5) | 26.0 (25.4 to 26.5) | 25.6 (25.1 to 26.0) | 25.9 (25.6 to 26.3 |
| Parous (%) | 68.6 (62.0 to 74.5) | 77.1 (72.1 to 81.5) | 84.3 (80.1 to 87.8) | 78.0 (75.1 to 80.4) |
| Ever married (%) | 76.3 (70.3 to 81.5) | 78.6 (73.7 to 82.8) | 78.1 (73.5 to 82.0) | 77.8 (75.0 to 81.1) |
| Degree level (%) | 36.7 (30.5 to 43.4) | 37.5 (32.2 to 43.1) | 26.1 (21.7 to 31.0) | 32.8 (29.7 to 36.0) |
| Professional and managerial class (%) | 70.0 (63.6 to 75.6) | 63.8 (58.3 to 68.9) | 60.3 (55.1 to 65.2) | 63.9 (60.7 to 67.0) |