Table 2.

Descriptive analysis for the AO Group classification.

Classification	MS		R3_1		R3_2		R2_1		R2_2		R1_1		R1_2
	n	%	n	%	n	%	n	%	n	%	n	%	n	%
AO A1	0	0	0	0	1	2	0	0	1	2	1	2	1	2
AO A2	0	0	1	2	1	2	0	0	1	2	0	0	2	4
AO B1	9	18	10	20	6	12	14	28	14	28	14	28	12	24
AO B2	8	16	10	20	20	40	9	18	8	16	7	14	10	20
AO B3	21	42	17	34	12	24	16	32	16	32	18	36	14	28
AO C1	7	14	8	16	5	10	4	8	4	8	6	12	5	10
AO C2	2	4	1	2	2	4	4	8	2	4	2	4	0	0
AO C3	3	6	3	6	3	6	3	6	4	8	2	4	6	12

MS: medical specialists, R3: third-year resident, R2: second-year resident, R1: first-year resident.

Source: SOT-HMMC, 2006.