Table 1.

Selected characteristics of the study population.

	Cases (N = 27)	Controls (N = 46)	p value
Maternal age, median (range)	31 (20–43)	32.5 (17–48)	0.23
Nulliparous, n (%)	10 (37)	21 (46)	0.47
BMI, median (range)∗	27 (20–49)	25.5 (18–48)	0.77
Smoking, n (%)	5 (18.5)	9 (20)	0.91
Gestational diabetes, n (%)	5 (18.5)	18 (39)	0.067
AC-delivery interval in weeks, median (range)	7.4 (0–17.7)	8.2 (0–24.3)	0.032
Gestational age at AC in weeks, median (range)	27.6 (22–32)	23.1 (17–38)	0.54
Gestational age at delivery in weeks, median (range)	37.9 (24–42)	38.3 (28–42)	0.013

^∗Missing  n = 1.

BMI, body mass index; AC, amniocentesis.