Table 2.

Clinical characteristics of patients according to occurrence of neonatal RDS

	RDS (−) ( n=129 )	RDS (+) ( n=114 )	P value
Maternal age (mean±SD)	31.5±4.2	31.7±4.7	NS
Parity (nulliparity) (%)	49.5 (64/129)	45.6 (52/114)	NS
Gestational age at delivery (weeks) (mean±SD)	29.5±1.9	28.4±2.1	<.001
Antenatal steroid use (%)	80.6 (104/129)	71.9 (82/114)	NS
Cesarean delivery (%)	61.2 (79/129)	79.8 (91/114)	.002
Sex (Male) (%)	52.7 (68/129)	53.5 (62/114)	NS
Birth weight (g) (mean±SD)	1281.5±411.4	1146.9±403.7	.007
1-min Apgar score of < 7 (%)	68.2 (88/129)	92.1 (105/114)	<.001
5-min Apgar score of < 7 (%)	40.3 (52/129)	68.4 (78/114)	<.001
Umbilical arterial pH of < 7.15* (%)	9.8 (11/112)	23.6 (25/106)	.006
Hypertensive disorders (%)	27.9 (36/129)	39.5 (45/114)	.056
Histological chorioamnionitis† (%)	46.7 (56/120)	28.7 (31/108)	.005
Funisitis‡ (%)	25.4 (31/122)	13.8 (15/109)	.027

^*Twenty-five cases that did not have the results of the umbilical arterial blood gas analysis were excluded from the analysis.

^†Fifteen cases that did not have histopathologic examinations of the placenta were excluded from the analysis.

^‡Twelve cases that had unavailable placental histological results for funisitis were excluded from the analysis.