Table 2.

Area under the curve values for AAP and Canadian criteria for ROP requiring treatment in Figure 3 and Figure 4, respectively.

Criteria	AUC	S.E.a	Asymptotic significanceb	Asymptotic 95% confidence interval
				Lower	Upper
AAP criteria
Gestational age (weeks)	0.695	0.087	.23	0.524	0.865
Body weight (g)	0.723	0.073	.009	0.581	0.866
Canadian criteria
Gestational age (weeks)	0.671	0.092	.049	0.492	0.851
Body weight (g)	0.694	0.079	.025	0.540	0.848

The test result variables had at least one tie between the positive actual state group and the negative actual state group. Statistics may be biased.

^aUnder the nonparametric assumption

^bNull hypothesis: true area=0.5, AUC ≥0.7 are acceptable.