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Table 1 Demographics and clinical characteristics of the study groups in both pregnancies

From: Early preterm delivery due to placenta previa is an independent risk factor for a subsequent spontaneous preterm birth

Measure Index Pregnancy 2ndpregnancy
  Normal placentation Placenta Previa P-value Normal placentation Placenta Previa P-value
  N = 9686 N = 297   N = 9875 N = 108  
Maternal Age (years) 27.18 ± 5.20 29.02 ± 5.04 <.001 30.03 ± 5.59 33.06 ± 4.92 <.001
Gravidity
1 42.2 (4086) 13.1 (39) <.001 0.0 (0) 0.0 (0) <.001
2-5 42.3 (4096) 60.6 (180)   77.0 (7603) 60.2 (65)
6+ 15.5 (1504) 26.3 (78)   22.9 (2263) 39.8 (43)
Parity
1 53.5 (4995) 20.4 (58) <.001 0.0 (0) 0.0 (0) <.001
2-5 38.0 (3552) 65.8 (187)   87.1 (8189) 79.2 (80)
6+ 8.5 (791) 13.7 (39)   12.4 (1169) 20.8 (21)
Prior preterm birth 17.0 (602/3541) 14.1 (26/185) .297 21.7 (2144/9875) 22.1 (24/108) .898
Infertility treatments 5.5 (531) 8.1 (24) .07 7.2 (709) 12.0 (13) .06
Mild preeclampsia 5.4 (520) 1.0 (3) <.001 3.5 (345) 2.8 (3) 1.0
Severe preeclampsia 5.3 (512) 1.7 (5) .003 1.7 (164) 0.9 (1) 1.0
Chronic Hypertension 2.5 (242) 1.3 (4) .25 3.0 (295) 2.8 (3) 1.0
GDM class A 6.4 (619) 7.7(23) .346 6.6 (651) 5.6 (6) .85
GDM class B-R 2.1 (201) 2.7 (8) .41 2.7 (265) 1.9 (2) 1.0
Hydramnios 6.5 (632) 5.4 (16) .55 5.5 (540) 4.6 (5) 1.0
Oligohydramnios 6.5 (627) 2.7 (8) .005 2.7 (265) 1.9 (2) 1.0
Preterm Delivery 16.6 (1611) 55.9 (166) <.001 9.6 (947) 51.9 (56) <.001
Cesarean section 100.0 (9686) 100 (297) --- 52.2 (5151) 96.3 (104) <.001
  1. Data presented as percent (number) or mean ± standard deviation.
  2. GDM- gestational diabetes.