TABLE 7.

Area under the receiver operating characteristic (ROC) curve derived using c-statistic for 10-fold cross-validation sets.

		Proximal			Aerial
Folds	N	Ordinal	Binary	N	Ordinal	Binary
1	16	0.83	0.82	16	0.92	0.94
2	16	0.83	0.82	16	0.93	0.93
3	16	0.83	0.81	17	0.92	0.93
4	17	0.84	0.83	17	0.93	0.94
5	17	0.82	0.82	17	0.92	0.93
6	17	0.83	0.81	17	0.93	0.93
7	17	0.83	0.82	17	0.92	0.94
8	17	0.84	0.83	17	0.94	0.93
9	17	0.83	0.85	17	0.92	0.92
10	17	0.82	0.82	17	0.92	0.93
Total	167			168
Mean		0.83	0.82		0.93	0.93

N is the number of data points assigned to the validation set for that fold. The model used for the c-statistic on each validation set was trained using the remaining (167 – N for proximal, and 168 – N for aerial) data points. All 10-fold sets were randomly generated.