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. Author manuscript; available in PMC: 2011 Aug 29.
Published in final edited form as: Ann Hum Biol. 2008 Sep-Oct;35(5):462–474. doi: 10.1080/03014460802311062

TABLE 2.

Fetal size, and ages at assessment and preterm labor for the study sample. Significant sex differences were found for both groups at 24 weeks, and among neonates from uncomplicated pregnancies at birth. Gestational ages at birth were younger for neonates delivered from pregnancies after preterm labor. Percentiles are sex- and age-adjusted with respect to the Chilean national reference (González et al. 2004). Data are medians (interquartile range) of percentiles (weight), weeks (age).

Group (n) EFW Gestational Age at EFW Birth Weight Gestational Age at birth Gestational Age at preterm labor
Uncomplicated
(n=3167)		 55
(37-71)		 24.3
(24 - 24.9)		 47
(23- 70)		 39.7
(38.9 - 40.4)
*Males
(n=1633)		 57
(41-75)		 52
(27-76)
Females
(n=1534)		 52
(33-68)		 40
(18-65)
Preterm labor, term birth
(n=147)		 57
(39-74)		 24.4
(24 -24.9)		 41
(25-67)		 *39
(38.1 - 39.7)		 32.4
(29.6-34.7)
*Males
(n=75)		 67
(42-77)
Females
(n=72)		 53
(38-65)
*

p<0.05;

EFW=Estimated fetal weight; data are medians (interquartile range) of percentiles (weight), weeks (age).