Table 4.

ROC curve results

	AUC	95% CI	Specificity	Sensitivity	Youden index	Cut off
Number of stones	0.647	0.562-0.731	80.65%	48.70%	29.34%	0.5
Location of stones	0.642	0.558-0.727	80.65%	47.83%	28.47%	0.5
Treatment method	0.606	0.508-0.705	61.29%	60.00%	21.29%	0.5

AUC: area under the curve.