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Table 3 Estimated sample size and computation assumptions for biometrical parameters

From: WHO multicentre study for the development of growth standards from fetal life to childhood: the fetal component

Biometrical parameter

Sample size

Variance

Rho

d (mm)

Biparietal Diameter

32

10.2

0.34

0.1

Head circumference

23

174

0.28

0.5

Abdominal circumference

28

263

0.43

0.5

Femur length

16

5

0.32

0.1

Humerus length

35

11

0.32

0.1