Table 3. Association between infant natal characteristics and ROP that required treatment (according to multivariable logistic regression analysis).

Variable	OR	P	95% CI
BWSDS for Infants with GA <26 weeks at birth (Swedish reference)	0.80	0.0007	0.70–0.91
BWSDS for Infants with GA ≥26 weeks at birth (Swedish reference)	0.56	<0.0001	0.47–0.67
GA	0.41	<0.0001	0.35–0.48
Male gender	1.45	0.0085	1.10–1.91

Abbreviations: BWSDS indicates birth weight standard deviation score; GA, gestational age; OR, odds ratio; ROP, retinopathy of prematurity.