Table 1 Distribution of covariates between case and control subjects
Covariate | Case group (N = 209) | Control group (N = 488) | ||||||
|---|---|---|---|---|---|---|---|---|
| Â | % | N | Mean | SD | % | N | Mean | SD |
Sex = male | 45.0 | 94 | Â | Â | 47.8 | 233 | Â | Â |
Smoking | 35.9 | 75 | Â | Â | 21.7 | 106 | Â | Â |
Q1 |  |  | 0.91 | 0.80 |  |  | −0.39 | 0.81 |
Q2 |  |  | 0.59 | 0.99 |  |  | −0.25 | 0.89 |
Q4 |  |  | −0.80 | 0.99 |  |  | 0.34 | 0.78 |