Regional Variation on Rates of Bronchopulmonary Dysplasia and Associated Risk Factors

Table 1

Demographic characteristics of population studied by cases and controls.

	All infants	BPD
		Cases	Controls	P
	𝑛=212	𝑛=64	𝑛=148
Maternal age, y, mean ± (SD)	27.2 (6.5)	26.1 (6.0)	27.3 (6.6)	0.205
Male (%)	108 (50.9)	34 (53.1)	74 (50.0)	0.676
Gestational age at birth, wPMA, mean ± (SD)	29.2 (1.3)	28.6 (1.2)	29.3 (1.3)	0.001
Birth weight, grams, mean ± (SD)	1271.2 (283.3)	1155.3 (263.0)	1306.5 (284.2)	0.000
SGA, 𝑛 (%)	12 (5.7)	3 (4.7)	9 (6.1)	0.688
APGAR score 5 min, median (IR)	9 (8-9)	9 (8-9)	9 (8-9)	0.228
SNAP-II, score, mean ± (SD)	5.7 (9)	7.6 (10.5)	5.4 (8.6)	0.102

BPD: bronchopulmonary dysplasia, wPMA: weeks postmenstrual age, SGA: small for gestational age, SNAP-II: score for neonatal acute physiology, SD: standard deviation, IR: Interquartile range (difference between the value at 75% of cases, and the value at 25% of cases).