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 | 0.000a |
| 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 %) | 0.109b |
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