Table 1.

Demographic and clinical characteristics of the study population (First study).

	Term Delivery (n=16)	PTL without IAI (n=19)	PTL with IAI (n=20)
Maternal age (years)	25 (16 – 38)	21 (17 – 45)	31 (19 – 41)
Nulliparity	47 (9/19)	56 (9/16)	25 (5/20)
Gestational age at amniocentesis (weeks)	27 (22 – 32)	28 (23 – 33)	26 (22 – 33)
Cervical dilatation (cm)	0 (0 – 1)	1.5 (0 – 5)	0 (0 – 5)
Amniocentesis to delivery interval (days)	86 (49 – 130)	1 (0 – 7)	3 (0 – 7)
Gestational age at delivery (weeks)	39 (37 – 42)	29 (23 – 33)	27 (22 – 34)
Sample storage time (months)	49 (15 – 73)	63 (22 – 80)	33 (8 – 63)

Values are presented as median (range) of percentage (number)

PTL: preterm labor; IAI: intra-amniotic infection/inflammation