Table 1 General data of the two group
|  | TTL (n = 24) | Rigid (n = 21) | P value |
|---|---|---|---|
Age | 65.5 ± 5.79 | 66.71 ± 5.55 | 0.478 |
Gender (male/female) | 14/10 | 10/11 | 0.472 |
Follow-up time (months) | 54.63 ± 4.32 | 57.76 ± 6.23 | 0.054 |
Operative segment | Â | Â | 0.926 |
 L3/5 | 6 | 5 |  |
 L4/S1 | 18 | 16 |  |
Primary diagnosis | Â | Â | 0.967 |
 Spinal stenosis | 15 | 13 |  |
 Lumbar disc herniation | 9 | 8 |  |
 lumbar spondylolisthesis (Grade I and Grade II) | 18 | 20 |  |
Operation time (min) | 145.83 ± 20.62 | 165.24 ± 19.90 | 0.003* |
Intraoperative blood loss (mL) | 168.79 ± 59.54 | 235.23 ± 74.41 | 0.002* |