Table 1

Corresponding Million Women Study (MWS) and National Survey of Health and Development (NSHD) variable descriptions

Age(s) when

Average age

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


* The following derived variables were also compared between the studies: Body mass index (derived from Weight and Height); Waist-to-hip ratio; Waist-to-height ratio.

† Among women matched to both studies.

Cairns et al. BMC Medical Research Methodology 2011 11:7   doi:10.1186/1471-2288-11-7

Open Data