Table 6.

Screening properties of the CAST against the moderate/severe class

	Sensitivity	Specificity	PPV	NPV	FPR	FNR	Correct	Y = sensitivity + specificity – 1
Boys	AUC = 0.877, 95% CI = 0.862–0.893
1	0.963	0.479	0.604	0.479	0.521	0.037	0.698	0.442
2	0.880	0.669	0.686	0.669	0.331	0.120	0.764	0.548
3	0.811	0.774	0.748	0.774	0.226	0.189	0.791	0.585
4	0.733	0.842	0.793	0.842	0.158	0.267	0.793	0.575
5	0.682	0.890	0.837	0.890	0.110	0.318	0.796	0.573
Girls	AUC = 0.853, 95% CI = 0.832–0.873
1	0.900	0.598	0.591	0.598	0.402	0.100	0.716	0.498
2	0.787	0.766	0.685	0.766	0.234	0.213	0.774	0.553
3	0.700	0.868	0.775	0.868	0.132	0.300	0.802	0.568
4	0.598	0.912	0.815	0.912	0.088	0.402	0.789	0.510
5	0.496	0.944	0.851	0.944	0.056	0.504	0.768	0.440
Total	AUC = 0.869, 95% CI = 0.856–0.881
1	0.944	0.526	0.587	0.526	0.474	0.056	0.700	0.470
2	0.851	0.705	0.673	0.705	0.295	0.149	0.766	0.556
3	0.775	0.809	0.743	0.809	0.191	0.225	0.795	0.584
4	0.689	0.867	0.787	0.867	0.133	0.311	0.793	0.556
5	0.619	0.909	0.830	0.909	0.091	0.381	0.788	0.528

PPV, positive predictive value; NPV, negative predictive value; FPR, false positive rate; FNR, false negative rate; Correct, percentage of correctly classified individuals; AUC, area under receiver operating characteristic curve; CI, confidence interval; Y, Youden index.