Table 1. Paired comparisons of clinical feature and perinatal outcomes between larger and smaller infants of 56 twin pairs.

Factors	Smaller infant (n=56)	Larger infant (n=56)	P
BW (g, mean±SD)	1475.22±364.32	1645.54±357.07	<0.001
BW≤1500 g	31 (55.36)	21 (37.50)	0.058
ROP	12 (21.42)	9 (16.07)	0.468
Severe ROP	3 (5.36)	5 (8.93)	0.463
Neonatal morbidities
Respiratory distress syndrome	26 (46.43)	28 (50.00)	0.705
Patent ductus arteriosus	18 (32.14)	23 (41.07)	0.372
Intraventricular hemorrhage	8 (14.29)	9 (16.07)	0.792
Sepsis	3 (5.36)	4 (7.14)	0.696
Neonatal characteristics
Female infant	29 (51.79)	21 (37.50)	0.128
1-min Apgar score <7	8 (14.29)	2 (3.57)	0.098
5-min Apgar score <7	4 (7.14)	3 (5.36)	0.696
Dexamethasone treatment	32 (57.14)	30 (53.57)	0.704
Surfactant treatment	23 (41.07)	29 (51.79)	0.256
Blood transfusion	38 (67.86)	31 (55.36)	0.174
Oxygen therapy	35 (62.50)	28 (52.17)	0.182
Mechanical ventilation	26 (46.43)	22 (39.28)	0.445

BW: Birth weight; ROP: Retinopathy of prematurity.

n (%)