Reducing surgical levels by paraspinal mapping and diffusion tensor imaging techniques in lumbar spinal stenosis

Table 7 Analysis of the outcome measures

Outcome measure	Experiment group (n = 55)	Control group (n = 59)	p-value
Levels of decompression	2.13 ± 0.64	2.64 ± 0.87	0.000^a
Operative time (min)	176.73 ± 63.28	215.32 ± 52.07	0.001
Blood loss	376.72 ± 247.90	502.54 ± 270.44	0.011
transfusion, n (%)	17(31 %)	36(61 %)	0.001
Leg dysesthesia, n (%)	3(5 %)	0(0 %)	0.109^b

^aBecause equal variances were not assumed, Satterthwaite separate variance estimation t-test was selected; ^bFisher’s exact test was selected because of the minimum theoretical expected frequency < 5; BP back pain, LP leg pain, ODI oswestry disability index, VAS visual analog scale

ISSN: 1749-799X