Table 2. Average injury severity score for each variable in AOSpine Thoracolumbar Injury Classification System.

Type	n	Mean	SD
A0	74	5.09	5.07
A1	74	14.78	7.74
A2	74	29.81	14.41
A3	74	44.68	16.99
A4	74	59.7	18.77
B1	74	54.88	18.41
B2	74	69.09	17.66
B3	74	71.49	15.94
C	74	94.8	10.18
N0	72	1.08	3.13
N1	72	19.19	17.14
N2	72	33.57	16.9
N3	72	79.79	19.07
N4	72	91.36	14.48
NX	72	66.96	28.42
M1	72	50	23.67
M2	72	62.4	24.18

Abbreviation: SD, standard deviation.