Table 2

Comparison of MWS characteristics between matched participants and others of a similar age

Variable

Matched

participants

MWS cohort born

± 1 yr of NSHD

P

difference*


Number of women at baseline

541

217,828

Number of women at resurvey

368

135,417

Age at baseline, yr, mean

52.1

52.1

Deprivation, % most deprived tertile

27.3

33.1

0.01

Maternal vital status, % alive

35.6

38.1

0.33

Self-reported at recruitment in the MWS

Height, cm, mean (SD)

162.6 (6.4)

162.1 (6.7)

0.07

Weight, kg, mean (SD)

68.8 (13.2)

68.7 (12.9)

0.78

BMI, kg/m2, mean (SD)

26.0 (4.6)

26.1 (4.8)

0.35

Age at menarche, yr, mean (SD)

13.2 (1.5)

13.3 (1.6)

0.02

Age at menopause, yr, mean (SD)

48.0 (5.0)

47.3 (5.8)

0.03

Use of oral contraceptives, % ever

72.2

73.0

0.66

Self-reported at resurvey in the MWS

Birth weight, kg, mean (SD)

3.24 (0.68)

3.22 (0.69)

0.69

Mother's height, cm, mean (SD)

160.6 (7.1)

160.4 (6.8)

0.61

Father's height, cm, mean (SD)

174.1 (7.7)

174.3 (7.8)

0.63

Waist circumference, cm, mean (SD)

75.8 (9.1)

75.7 (9.3)

0.96

Hip circumference, cm, mean (SD)

99.9 (8.1)

99.6 (7.8)

0.52

Waist-to-hip ratio, mean (SD)

0.76 (0.06)

0.76 (0.06)

0.38

Waist-to-height ratio, mean (SD)

0.47 (0.06)

0.47 (0.06)

0.99

Whether breastfed, % ever breastfed

73.0

69.7

0.23

Body size, age 10

% thinner

25.8

29.9

0.23

% average

56.0

52.4

% plumper

18.2

17.7

Body size, age 20

% size < 12

29.8

31.7

0.27

% size 12-14

58.1

58.4

% size 16+

12.1

9.9

Clothes size

% size < 14

30.9

32.0

0.18

% size 14-16

44.8

49.1

% size 18+

24.3

18.9

Bra band size

% size 36

22.8

23.9

0.34

% size 36-38

56.0

59.4

% size 40+

21.3

16.7


MWS: Million Women Study. NSHD: National Survey of Health and Development.

* P from ANOVA for continuous variables and from chi-squared tests of association for categorical variables.

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

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