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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

FIGURE 1. Change in size relative to peers across the third trimester.

FIGURE 1

Fetuses delivered at term from pregnancies complicated by preterm labor (median gestational age of 32.4 weeks, interquartile range, 29.6-34.7weeks) were relatively smaller than their peers at birth compared to that at the end of the second trimester (median age 24.3 gestational weeks). Estimated fetal weight standard scores at 24 weeks were sex-stratified, internal z-scores; birth standard scores represent the sex-stratified population reference to correct for significant gestational age at birth effects (González et al., 2004).