Table 5

Associations between ordinal MWS body size variables at various ages and corresponding NSHD anthropometry

Spearman

P

MWS variable and age

NSHD variable (units) and age

N

r*

(trend)†


Relative body size at age 10

Body mass index (kg/m2) at age 11

306

0.51

<0.001

Clothes size at age 20

Body mass index (kg/m2) at age 20

302

0.63

<0.001

Clothes size at resurvey

Body mass index (kg/m2) at age 53

316

0.79

<0.001

Clothes size at resurvey

Waist circumference (cm) at age 53

316

0.79

<0.001

Bra band size at resurvey

Chest circumference (cm) at age 53

291

0.73

<0.001


MWS: Million Women Study. NSHD: National Survey of Health and Development. N: numbers of women with non-missing values for both the MWS and NSHD variables.

* Spearman rank correlation coefficient for the strength of a monotonic relationship between the ordinal MWS variable and the continuous NSHD variable.

P-values for overall significance of linear regressions of continuous NSHD values against ordinal MWS values.

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

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