Table 3.

Instrumented levels and risks for intra-pedicular accuracy

Level	A	B	A + B	C	D	E	Intact (%)	Breached (%)	Raw OR (95%Cl)	p
T11	12	1	13	1	0	2	12 (3.6)	4 (1.2)	2.166 (0.653–6.862)	0.364
T12	33	5	38	2	2	2	33 (9.9)	11 (3.3)	2.333 (1.084–5.022)	0.270
L1	42	3	45	6	2	1	42 (12.7)	12 (3.6)	1.984 (0.953–4.128)	0.063
L2	34	7	41	0	2	1	34 (10.2)	10 (3.0)	1.995 (0.910–4.374)	0.080
L3	17	3	20	0	0	0	17 (5.1)	3 (0.9)	1.075 (0.302–3.820)	0.911
L4	56	4	60	0	0	0	56 (16.9)	4 (1.2)	0.380 (0.131–1.104)	0.066
L5	67	2	69	1	0	0	67 (20.2)	3 (0.9)	0.222 (0.067–0.737)	0.013
S1	24	0	24	0	0	0	24 (7.2)	0 (0.0)	0	0.998
Total	285	25	310	10	6	6	285 (85.8)	47 (14.2)	–	–

A optimal position, A + B clinically acceptable position