Table 3.

Class A subtype classification test results (sheets).

Type of fracture	Single category correct rate	Sensitivity	Specificity	Positive predictive value	Negative predictive value	Youden index
Type A1	0.985	0.875	1.000	0.999	0.979	0.877
Type A2	0.947	0.940	0.958	0.919	0.964	0.896
Type A3	0.983	0.773	0.988	1.000	0.986	0.772
Type A4	0.916	0.902	0.922	0.8655	0.940	0.825