Table 1.
Summary of patient profile (values are mean±SD, number and percent)
| Patient data | Group 1 (n = 36,70.6%) | Group 2 (n = 15,29.4%) | P |
|---|---|---|---|
| Ratio of males to females | 26:10 | 12:3 | 0.730 |
| Age at second operation (years) | 42.3 ± 11.0 | 42.0 ± 7.0 | 0.936 |
| BMI(kg/m2) | 23.6 ± 2.2 | 23.7 ± 2.8 | 0.901 |
| Cigarette smokers | 13 (36.1%) | 11 (73.3%) | 0.029 |
| Time between two operations (months) | 42.8 ± 45.1 | 44.4 ± 35.9 | 0.905 |
| Length of symptom relief after primary surgery (months) | 35.4±42.4 | 31.5±30.6 | 0.749 |
| Length of symptom episode after primary surgery (months) | 7.5 ± 4.8 | 12.9 ± 10.6 | 0.014 |
| Injury history | 6 (16.7%) | 8 (53.3%) | 0.014 |
| Preoperative JOAscore | 9.8 ± 2.5 | 8.5 ± 2.2 | 0.098 |
| Number of RLDH cases combined with fibrosis or scar | 17 (47.2%) | 12 (80%) | 0.031 |
| Complications | 5 (13.9%) | 3 (13.3%) | 0.733 |
| Dural tear | 2 | 3 | |
| Nerve root injury | 2 | ||
| Deep infection | 1 |