. Author manuscript; available in PMC: 2012 Dec 6.

Published in final edited form as: J Matern Fetal Neonatal Med. 2007 Jan;20(1):15–22. doi: 10.1080/14767050601036212

Table I.

Clinical and demographic characteristics of the study population

	Normal pregnancy midgestation n=75	Term gestation no labor n=28	Term gestation in labor N=51
Maternal age (y)	36.5 (35–38)	29 (21.5–32)	23 (20–27)
Nulliparity	11 (14.7)	5 (20.8)	23 (46)
Gestational age at amniocentesis (wks)	16 (16–17)	39.5 (38.7–40)	39.2 (38–40)
Gestational age at delivery (wks)	39 (38–40)	39.5 (38.7–40)	39.2 (38–40)
Birthweight (g)	3348 (3078.7–3623.7)	3420 (3165–3635)	3250 (3090–3680)

Values are expressed as median (25–75 percentile) or number (percent)