Table 2.
The distribution of neonatal characteristics and delivery methods stratified by parity
| Variables | Nulliparous | Multiparous | p-valuea |
|---|---|---|---|
| N = 112,907(%) | N = 38,426(%) | ||
| Neonatal characteristics | |||
| Gestation age | <0.01 | ||
| 26-36w | 17,513 (15.51)# | 3556(9.25) | |
| 37-39w | 43,734 (38.73) | 14,740 (38.36) | |
| 40-42wb | 50,526 (44.75) | 19,880 (51.74) | |
| Above 42w | 1134(1.00) | 250(0.65) | |
| Neonatal birth weight | <0.01 | ||
| 500-2499 g | 11,613 (10.29) | 2159(5.62) | |
| 2500–3999gb | 89,868 (79.59) | 33,970 (88.40) | |
| above 4000 g | 11,426 (10.12) | 2297(5.98) | |
| Vertex malposition | 3007(2.66) | 98(0.26) | <0.01 |
| Twins or multiplets pregnancy | 3285(2.91) | 871(2.27) | <0.01 |
| Placenta previa | 1833(1.62) | 295(0.77) | <0.01 |
| Placenta accreta | 92(0.08) | 10(0.03) | <0.01 |
| Placental abruption | 1167(1.03) | 167(0.43) | <0.01 |
| Placental retention | 541(0.48) | 115(0.30) | <0.01 |
| Amniotic fluid volume abnormality | <0.01 | ||
| Noneb | 101,805 (90.17) | 36,315 (94.51) | |
| Polyhydramnios | 716(0.63) | 219(0.57) | |
| Oligohydramnios | 10,386(9.20) | 1892(4.92) | |
| PROM | 20,413 (18.08) | 3895 (10.14) | <0.01 |
| Delivery methods | <0.01 | ||
| Cesarean section | 50,543 (44.77) | 104,44 (27.18) | |
| VD- Episiotomy | 12,961 (11.48) | 10,184 (26.50) | |
| VD- Forceps-assisted | 650(0.58) | 107(0.28) | |
| VD- Vacuum-assisted | 230(0.20) | 56(0.15) | |
| SVD without instrumentsb | 48,523 (42.98) | 17,635 (45.89) | |
Note: #The percentage is the proportion of the row total. The percentages are compared vertically, not horizontally. PROM Premature rupture of membrane, SVD Spontaneous vaginal delivery
a, p-value derived from the chi-square test; b, Reference group