Table 1 The general characteristics of study subjects
From: CHRNA5/CHRNA3 gene cluster is a risk factor for lumbar disc herniation: a case-control study
Independent variables | LDH patients | Healthy controls | p value |
|---|---|---|---|
(n = 380) | (n = 400) | ||
Age | |||
≤ 50 [N (%)] | 177 (46.6%) | 203 (51.0%) | |
> 50 [N (%)] | 203 (53.4%) | 197 (49.0%) | |
Gender | 0.610 | ||
Female [N (%)] | 152 (40%) | 166 (41.0%) | |
Male [N (%)] | 228 (60%) | 234 (59.0%) | |
Mean age (mean ± SD, years) | 50.43 ± 12.27 | 50.79 ± 8.13 | 0.629 |
Smoking | |||
Yes | 43 (11.3%) | 186 (46.5%) | |
No | 337 (88.7%) | 214 (53.5%) | |
Drinking | |||
Yes | 12 (3.2%) | 168 (42.0%) | |
No | 368 (96.8%) | 232 (58.0%) | |