Risk factors of extrauterine growth restriction in very preterm infants with bronchopulmonary dysplasia: a multi-center study in China

Table 1 EUGR at different levels of BPD, gestational age, and birthweight

		Number(n)	Proportion(%)	EUGR[n(%)]	Z	P
Subjects, n		1010	—	450	—	—
Severity of BPD	Mild	661	65.5	255 (38.6)	40.216	< 0.001
	Moderate^a	265	26.2	134 (50.6)
	Severe^a,b	84	8.3	61 (72.6)
Gestational age, wk	< 28	258	25.5	122 (47.3)	4.671	0.097
	28–29⁺⁶	451	44.7	184 (40.8)
	30–31⁺⁶	301	29.8	144 (47.8)
Birthweight, g	< 1000	179	17.7	118 (65.9)	59.046	< 0.001
	1000–1499^c	684	67.7	297 (43.4)
	≥ 1500^c,d	147	14.6	35 (23.8)

^aP < 0.0125 cf. the baseline mild BPD group; ^bP < 0.0125 cf. the baseline moderate BPD group; ^cP < 0.0125 cf. the baseline birthweight < 1000 g group; ^dP < 0.0125 cf. the baseline birthweight 1000–1499 g group

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