Table 2. Stratification of gestational age and birth weight by indication for delivery.
| Delivery indication | Gestational age | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 23 wk 0 d–27 wk 6 d (n = 26) | 28 wk 0 d–32 wk 6 d (n = 89) | 33 wk 0 d–36 wk 6 d (n = 476) | ||||||||||||||||
| Total n (%) | SVD n (%) | CD n (%) | p Value | Total n (%) | SVD n (%) | CD n (%) | p Value | Total n (%) | SVD n (%) | CD n (%) | p Value | |||||||
| Severe preeclampsia | 7 (27%) | 1 (8%) | 6 (43%) | 0.08 | 42 (47%) | 13 (34%) | 29 (57%) | 0.034 | 162 (34%) | 87 (27%) | 75 (48%) | < 0.001 | ||||||
| Placental abruption | 1 (4%) | 1 (8%) | 0 (0%) | 0.46 | 7 (8%) | 2 (5%) | 5 (10%) | 0.694 | 3 (0.6%) | 0 (0%) | 3 (2%) | 0.04 | ||||||
| PTL/PPROM | 13 (50%) | 9 (75%) | 4 (29%) | 0.047 | 30 (34%) | 22 (58%) | 8 (16%) | < 0.001 | 244 (51%) | 202 (64%) | 42 (27%) | < 0.001 | ||||||
| Fetal indication | 2 (8%) | 0 (0%) | 2 (14%) | 0.48 | 11 (12%) | 1 (3%) | 10 (20%) | 0.02 | 53 (11%) | 26 (8%) | 27 (17%) | 0.004 | ||||||
| Chorioamnionitis | 3 (12%) | 1 (8%) | 2 (14%) | 1 | 1 (1%) | 0 (0%) | 1 (2%) | 1 | 1 (0.2%) | 1 (0.3%) | 0 (0%) | 1 | ||||||
| Previa/accreta | 1 (4%) | 0 (0%) | 1 (7%) | 1 | 2 (2%) | 0 (0%) | 2 (4%) | 0.505 | 13 (3%) | 0 (0%) | 13 (8%) | < 0.001 | ||||||
| Birth weight | ||||||||||||||||||
| Delivery indication | < 750 g ( n = 7) | 750–999 g ( n = 17) | 1,000–1,499 g ( n = 52) | 1,500–1,999 g ( n = 88) | 2,000–2,499 g ( n = 176) | ≥ 2,500 g ( n = 251) | ||||||||||||
| SVD n (%) | CD n (%) | p Value | SVD n (%) | CD n (%) | p Value | SVD n (%) | CD n (%) | p Value | SVD n (%) | CD n (%) | p Value | SVD n (%) | CD n (%) | p Value | SVD n (%) | CD n (%) | p Value | |
| Severe preeclampsia | 0 (0%) | 2 (67%) | 0.14 | 1 (14%) | 4 (40%) | 0.34 | 10 (42%) | 22 (79%) | 0.01 | 18 (44%) | 27 (57%) | 0.21 | 34 (27%) | 19 (40%) | 0.09 | 38 (23%) | 36 (41%) | 0.003 |
| Placental abruption | 0 (0%) | 0 (0%) | – | 1 (14%) | 0 (0%) | 0.41 | 1 (4%) | 1 (4%) | 1 | 1 (2%) | 3 (6%) | 0.62 | 0 (0%) | 2 (4%) | 0.07 | 0 (0%) | 2 (2%) | 0.119 |
| PTL/PPROM | 4 (100%) | 1 (33%) | 0.14 | 4 (57%) | 1 (10%) | 0.10 | 11 (46%) | 3 (11%) | 0.01 | 18 (44%) | 9 (19%) | 0.01 | 78 (61%) | 10 (21%) | < 0.001 | 118 (72%) | 30 (35%) | < 0.001 |
| Fetal indication | 0 (0%) | 0 (0%) | – | 0 (0%) | 3 (30%) | 0.23 | 2 (8%) | 4 (14%) | 0.67 | 3 (7%) | 9 (19%) | 0.13 | 14 (11%) | 10 (21%) | 0.09 | 8 (5%) | 13 (15%) | 0.01 |
| Chorioamnionitis | 0 (0%) | 0 (0%) | – | 1 (14%) | 2 (20%) | 1 | 0 (0%) | 0 (0%) | – | 0 (0%) | 1 (2%) | 1 | 1 (1%) | 0 (0%) | 1 | 0 (0%) | 0 (0%) | – |
| Previa/accreta | 0 (0%) | 0 (0%) | – | 0 (0%) | 1 (10%) | 1 | 0 (0%) | 1 (4%) | 1 | 0 (0%) | 0 (0%) | – | 0 (0%) | 7 (15%) | < 0.001 | 0 (0%) | 7 (8%) | 0.001 |
Abbreviations: CD, cesarean delivery; PPROM, preterm premature rupture of membranes; PTL, preterm labor; SVD, spontaneous vaginal delivery.
Note: PTL and PPROM were noted to be the most common indications for preterm delivery. Some patients had more than one indication for delivery (i.e., severe preeclampsia and placental abruption) and in those cases, all indications were included in calculations. Not noted in this table were deliveries for renal disease (n = 1) and deliveries for miscellaneous other indications (n = 6). The p value designates the significance of difference comparing SVD to CD. Bold values show a significant difference (p < 0.05) between cesarean delivery and vaginal delivery groups.