Table 1.

Demographic information of the fetuses used in this study

Subgroup	GW range [mean ± sd]	Sex (M/F)
G early (n = 16)	22.0 ~ 24.7 [23.5 ± 0.8]	10/6
G mid (n = 16)	25.1 ~ 28.0 [26.6 ± 0.9]	10/6
G late (n = 16)	28.6 ~ 32.0 [30.1 ± 1.0]	10/6
All (n = 48)	22.0 ~ 32.0 [26.7 ± 2.9]	30/18

GW, gestational week; sd, standard deviation; M, male; and F, female.