Table 3. Stratification of mode of delivery and neonatal outcome by birth weight.

Birth weight	ROP			NEC			Death			RDS			Composite neonatal outcome
	SVD n (%)	CD n (%)	p Valuea	SVD n (%)	CD n (%)	p Valuea	SVD n (%)	CD n (%)	p Valuea	SVD n (%)	CD n (%)	p Valuea	SVD n (%)	CD n (%)	p Valuea
< 750 g n = 7	1 (14%)	0	1	1 (14%)	1 (14%)	1	1 (14%)	0	1	4 (57%)	2 (29%)	0.43	4 (57%)	2 (29%)	0.43
750–999 g n = 17	2 (12%)	1 (6%)	0.54	1 (6%)	0	0.41	0	1 (6%)	1	5 (29%)	7 (41%)	1	6 (35%)	7 (41%)	0.60
1,000–1,499 g n = 52	5 (10%)	3 (6%)	0.45	0	0	–	1 (2%)	1 (2%)	1	12 (23%)	21 (40%)	0.06	13 (25%)	21 (40%)	0.12
1,500–1,999 g n = 88	1 (1%)	2 (2%)	1	1 (1%)	0	0.47	1 (1%)	0	0.47	7 (8%)	22 (25%)	0.003	8 (9%)	22 (25%)	0.01
2,000–2,499 g n = 176	0	0	–	0	0	–	0	0	–	15 (9%)	8 (5%)	0.39	15 (9%)	8 (5%)	0.39
≥ 2,500 g n = 251	0	0	–	0	0	–	0	0	–	11 (4%)	10 (4%)	0.19	11 (4%)	10 (4%)	0.19

Abbreviations: CD, cesarean delivery; NEC, necrotizing enterocolitis; RDS, respiratory distress syndrome; ROP, retinopathy of prematurity; SVD, spontaneous vaginal delivery.

Note: RDS was significantly more likely with CD in the 1,500–1,999 g group (p = 0.003) and contributed to the significant difference in overall composite neonatal outcome with a higher rate among infants delivered via CD. Although grade III intraventricular hemorrhage was included in our composite neonatal outcome, it is not shown in this table because there was only one such case in the entire population (1,000–1,499 g group) and did not contribute to the significant difference. Bold values show a significant difference (p < 0.05) between cesarean delivery and vaginal delivery groups.

^a p Value denotes significant difference for each outcome among the birth weight strata, comparing SVD to CD.