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Table 1 Maternal and infant characteristics according to the interval between prelabor rupture of membranes and delivery

From: Prelabor rupture of membranes and the association with cerebral palsy in term born children: a national registry-based cohort study

 Reference groupIntermediate intervalaProlonged intervalb 
N(%)N(%)N(%) 
Number of births494,881(100)34,759(100)30,332(100)P-value
Maternal agee
  < 1911,681(2.4)784(2.3)623(2.1) 
 20–34401,202(81)28,727(83)24,609(81) 
  > 3581,977(17)5245(15)5097(17)0.55c
Parity
 Para 0185,723(38)21,827(63)19,257(64) 
  > 0 Para309,158(63)12,932(37)11,075(37)< 0.001c
Any maternal diagnosis before pregnancy204,310(41)14,545(42)13,391(44)< 0.001c
Any maternal diagnosis during pregnancy145,583(29)9959(29)8889(29)0.096c
Diabetes mellitusf
 Diagnosed before pregnancy2671(0.5)221(0.6)164(0.5) 
 Gestational4462(0.9)375(1.1)285(0.9)0.007d
Thyroid disease6888(1.4)495(1.4)465(1.5)0.046c
Recurrent urinary tract infection15,458(3.1)1173(3.4)1105(3.6)< 0.001c
Chronic kidney disease2707(0.5)178(0.5)160(0.5)0.45c
In vitro fertilizationg6904(1.4)706(2.0)675(2.2)< 0.001c
Presentationh
 Cephalic454,795(93)31,640(91)27,636(92) 
 Non-cephalic36,624(8)2960(9)2489(9)< 0.001c
Induction42,894(9)4139(12)10,065(33)< 0.001c
Caesarean sectioni
 Elective29,941(6)58(0.2)175(0.6) 
 Acute33,704(7)4487(13)4427(15) 
 No430,475(87)30,179(87)25,684(85)< 0.001d
Sex
 Male251,018(51)18,348(53)15,876(52) 
 Female243,863(49)16,411(47)14,456(48)< 0.001c
Small for gestational age7140(1.4)367(1.1)407(1.3)< 0.001c
Apgar at 5 minutesj
 0–31493(0.3)126(0.4)95(0.3) 
 4–63103(0.6)404(1.2)384(1.3) 
 7–10489,117(99)34,190(99)29,815(98)< 0.001c
  1. a12–24 h between prelabor rupture of membranes (PROM) and delivery; b >  24 h between PROM and delivery
  2. c Linear-by-linear test for association
  3. d Kruskal-Wallis
  4. e Information on maternal age was missing in 21 children in the reference group, 3 children in the intermediate and in 3 children in the prolonged interval group
  5. f Information on Diabetes Mellitus was missing in 266 children in the reference group, 32 in the intermediate and 18 children in the prolonged interval group
  6. g Information on IVF was missing in 731 children in the reference group, 82 children in the intermediate and 63 children in the prolonged interval group
  7. h Information on Presentation was missing in 3462 children in the reference group, 159 children in the intermediate and 207 children in the prolonged interval group
  8. i Information on Caesarean section was missing in 761 children in the reference group, 35 children in the intermediate and 46 in the prolonged interval group
  9. j Information on Apgar was missing in 1168 children in the reference group, 39 children in the intermediate group and 38 children in the prolonged interval group