Regional Variation on Rates of Bronchopulmonary Dysplasia and Associated Risk Factors

Table 2

Distribution of maternal characteristics by BPD status.

Characteristics	All infants	BPD
		Cases	Controls	𝑃	OR^*		95% CI
	𝑛=212	𝑛=64	𝑛=148
Maternal characteristics
Mean age, 𝑛 (%)
<18 years	15 (7.1)	5 (7.8)	10 (6.8)		1.08	0.38	3.08
18–35 years	173 (81.6)	52 (81.3)	121 (81.8)	0.959	1.00
>35 years	24 (11.3)	7 (10.9)	17 (11.5)		0.97	0.50	1.88
Type of delivery, 𝑛 (%)
Vaginal	35 (16.5)	12 (18.8)	23 (15.5)	0.563	1.00
Cesarean	177 (83.5)	52 (81.3)	125 (84.5)		0.86	0.51	1.43
Multiple gestation 𝑛 (%)	22 (10.4)	6 (9.4)	16 (10.8)	0.753	0.89	0.44	1.83
Antenatal steroids, 𝑛 (%)	184 (86.8)	56 (87.5)	128 (86.5)	0.072	1.32	0.63	2.75
PPROM, 𝑛 (%)	76 (35.8)	30 (46.9)	46 (31.2)	0.028	1.58	1.06	2.36
Duration of rupture of membranes, 𝑛 (%)
<24 h	35 (46.1)	12 (40.0)	23 (50.0)	0.275	1.00
24–48 h	14 (18.4)	5 (16.7)	9 (19.6)		0.76	0.14	4.02
48–72 h	8 (10.5)	2 (6.7)	6 (13.0)		1.76	0.52	5.94
>72 h	19 (25.0)	11 (36.7)	8 (17.4)		1.04	0.45	2.41
Chorio confirmed, 𝑛 (%)	11 (5.2)	4 (6.5)	7 (4.7)	0.647	1.22	0.54	2.74
Chorio confirmed or suspected, 𝑛 (%)	39 (18.4)	17 (26.6)	22 (14.9)	0.044	1.60	1.04	2.47

Chorio: chorioamnionitis, PPROM: preterm premature rupture of membranes.