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) | Â | 77.0 (7603) | 60.2 (65) | |
6+ | 15.5 (1504) | 26.3 (78) | Â | 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) | Â | 87.1 (8189) | 79.2 (80) | |
6+ | 8.5 (791) | 13.7 (39) | Â | 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 |