Table 3.

Distribution of malleolar fractures by type (44A–C), specified by type, group, and subgroup. Values are count (%) for samples > 100

AO type	Train (n = 4,941)	Test (n = 409)
44A (483 train and 31 test cases)
1.1	78 (22)	6
1.2	165 (46)	7
1.3	114 (32)	9
2.1	105 (93)	5
2.2	1 (1)	–
2.3	7 (6)	2
3.1	11	–
3.3	2	2
44B (1,015 train and 136 test cases)
1.1	385 (74)	39
1.2	132 (25)	26
1.3	6 (1.1)	2
2.1	99 (44)	20
2.2	105 (47)	16
2.3	19 (8.5)	2
3.1	76 (28)	12
3.2	152 (56)	13
3.3	41 (15)	6
44C (255 train and 47 test cases)
C1
1.1	85 (67)	17
1.2	20 (16)	5
1.3	22 (17)	2
2.1	30	6
2.2	21	3
2.3	39	9
3.1	10	3
3.2	9	1
3.3	19	1