Table 1.
Characteristics of participants included in primary analyses of anthropometry by menopause type (n=915)
| Natural menopause n=675 (n=672, 99.6% pre-menopausal at age 36 years (first measure of WC/BMI)) | Hysterectomy n=240 (n=215, 89.6% pre-menopausal at age 36 years (first measure of WC/BMI)) | |
| n (%) | n (%) | |
| Household social class | ||
| Professional/intermediate | 256 (37.9) | 76 (31.7) |
| Skilled (non-manual) | 241 (35.7) | 80 (33.3) |
| Skilled manual and partly skilled | 132 (19.6) | 70 (29.2) |
| Unskilled | 46 (6.8) | 14 (5.8) |
| Parity | ||
| 0 | 100 (14.8) | 15 (6.3) |
| 1 or 2 | 379 (56.2) | 130 (54.2) |
| 3 or more | 196 (29.0) | 95 (39.6) |
| Current smoking at age 36 | 233 (34.5) | 91 (37.9) |
| Physical activity at age 36 | ||
| Inactive | 275 (40.7) | 110 (45.8) |
| Less active | 167 (24.7) | 53 (22.1) |
| Most active | 233 (34.5) | 77 (32.1) |
| HRT use | ||
| Age 36 | 4/652 (0.6) | 5/235 (2.1) |
| Age 43 | 15/623 (2.4) | 17/228 (7.5) |
| Age 53 | 91/512 (17.8) | 101/174 (58.1) |
| Age 60–64 | 9/498 (1.8) | 22/173 (12.7) |
| Age 69 | 8/465 (1.7) | 8/168 (4.8) |
| Mean age at menarche (SD) | 13.1 (1.3) | 12.9 (1.1) |
| Mean age at period cessation (SD) | 51.5 (3.9) | 44.1 (6.2) |
BMI, body mass index; HRT, hormone replacement therapy; WC, waist circumference.