Table 1 Corresponding Million Women Study (MWS) and National Survey of Health and Development (NSHD) variable descriptions
| Â | Â | Age(s) when | Â | Average age |
|---|---|---|---|---|
| Â | NSHD variables | recorded | MWS variables | of reporting |
Variable* | (measured, M, or reported, R) | (years) | (self-reported) | (years)†|
Birth weight | Birth weight (M) | 0 | Birth weight | 55.3 |
Whether breastfed | Duration breastfed (R by mother) | 2 | Whether breastfed (yes/no) | 55.3 |
Mother's height | Mother's height (R by parent) | 6 | Mother's height | 55.3 |
Father's height | Father's height (R by parent) | 6 | Father's height | 55.3 |
Body size, age 10 | Body mass index (M) | 11 | Relative body size at age 10 | 55.3 |
Age at menarche | Whether periods started and age (R by mother) | 14-15 | Age at which periods started | 52.1 |
Body size, age 20 | Body mass index (R) | 20 | Clothes size at age 20 | 55.3 |
Use of oral contraceptives | Ever use of oral contraceptives (R) | 31, 43 | Ever use of oral contraceptives | 52.1 |
Age at menopause | Date of last period if stopped for 12+ months (R) | 47-54, 57 | Age when periods stopped for 6+ months | 52.1 |
Weight | Weight (M) | 53 | Weight | 52.1 |
Height | Height (M) | 53 | Height | 52.1 |
Body size | BMI derived from weight and height (M) | 53 | Clothes size at resurvey | 55.3 |
Waist circumference | Waist circumference (M) | 53 | Waist circumference | 55.3 |
Hip circumference | Hip circumference (M) | 53 | Hip circumference | 55.3 |
Chest circumference | Chest circumference (M) | 53 | Bra band size at resurvey | 55.3 |