Use of Near-Infrared Spectroscopic Analysis of Second Trimester Amniotic Fluid to Assess Preterm Births

Table 1

Population Demographics.

Maternal/Fetal Characteristics^a	≤35 weeks	≥37 weeks	P
Gestational Age (wks)	34.8±2.4^∗	39.3±1.9	N/A
Maternal Age (yrs)	37.5±1.7	37.6±2.4	0.4
Pre-pregnancy BMI (kg/m^2)	23.8±4.3	23.8±4.9	0.6
Amniocentesis Week	15.5±0.8^†	15.2±1.0^‡	0.8
Birth weight (g)	2555±540	3429±623	<0.05
Parity	1.2±0.6	1.1±1.1	<0.05

^aData are reported as means ± standard deviation. Population characteristics for mothers delivering in term (n = 216) and preterm (n = 11). *Range is 28.5–35.1 weeks. ^†Range is 14–17 weeks. ^‡Range is 12–20 weeks.