Table 1

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)