Demographic variables of the patients in the 2 groups.
| Variable | LESI (n = 129) | Non-LESI (n = 186) | P Value |
| Age, y, mean (SD) | 42.9 (10.4) | 44.1 (9.8) | 0.30 |
| Age distribution, y, n | |||
| 21–35 | 48 | 69 | 0.76 |
| 36–50 | 60 | 92 | |
| 51–65 | 21 | 25 | |
| Gender, n | |||
| Men | 79 | 113 | 0.93 |
| Women | 50 | 73 | |
| Body mass index, mean (SD) | 23.3 (2.6) | 23.9 (3.2) | 0.08 |
| Duration of symptoms, mo, mean (SD) | 3.5 (1.5) | 2.9 (1.8) | 0.002 |
| Comorbidities, n | |||
| Hypertension | 7 | 12 | 0.71 |
| Diabetes mellitus | 19 | 20 | 0.38 |
| Cardiac disease | 2 | 5 | 0.78 |
| Chronic obstructive pulmonary disease | 3 | 2 | 0.68 |
| Thyroid disorder | 5 | 8 | 0.92 |
| Dyslipidemia | 7 | 11 | 0.95 |
| Smoking | 14 | 19 | 0.95 |
a A P value of <0.05 was considered to be statistically significant (in boldface).
LESI, lumbar epidural steroid injection.