Table 2. AUC and 95%CIs of factors related to the prediction of ROP.

Point of comparison	ROP vs absent ROP
	AUC	95%CI
		Lower limit	Upper limit
Birth weight+GA	0.737	0.668	0.806
Weight gain ratio at:
7d	0.730	0.655	0.805
14d	0.808	0.745	0.870
21d	0.866	0.818	0.914
28d	0.930	0.901	0.958
Birth weight+GA+weight gain ratio at:
7d	0.801	0.741	0.860
14d	0.862	0.811	0.913
21d	0.891	0.852	0.930
28d	0.934	0.906	0.962

AUC: Area under the ROC curve; CI: Confidence interval; GA: Gestational age.