Table 1.
Patient characteristics
| Parameter | Unilateral fixation group | Bilateral fixation group | P |
|---|---|---|---|
| No. of patients | 33 | 35 | |
| Age (years)a | 59.4 ± 10.2 | 55.7 ± 11.6 | 0.171 |
| Sex (F/M)b | 19/14 | 25/10 | 0.232 |
| Symptom duration | 8.5 months to 12 years | 11 months to 18 years | NS |
| Diagnosisb | |||
| Spinal stenosis | 11 | 16 | 0.297 |
| Symptomatic DDD | 13 | 9 | 0.228 |
| Spondylolisthesis | 5 | 7 | 0.600 |
| Failed back surgery | 4 | 3 | 0.705 |
| Operated level, No.b | |||
| L4-S1 | 20 | 23 | 0.662 |
| L3-L5 | 12 | 10 | 0.492 |
| L2-L4 | 1 | 2 | 1.00 |
| Operation time (min)a | 208 (126–275) | 257 (158–300) | 0.000 |
| Blood loss (ml)a | 391 (230–780) | 546 (310–980) | 0.000 |
| Hospital stay(days)a | 12.5 (7–21) | 13.7 (8–18) | 0.134 |
M male, F female, DDD degenerative disk disease, NS not significant
a Data were compared by t test
b Data were compared by chi-square test