Table 2. Baseline data of patients in the case group and control group.
| Variable | Case group (n=400) | Control (n=400) | P-value |
|---|---|---|---|
| Age (years, mean ± S.D.) | 56.6 ± 9.3 | 55.7±10.5 | 0.200 |
| Males, number (%) | 184 (46.0%) | 189 (47.3%) | 0.723 |
| BMI (kg/m2, mean ± S.D.) | 25.7 ± 1.8 | 25.5 ± 2.0 | 0.138 |
| Family history, number (%) | 40 (10.0%) | 35 (8.8%) | 0.544 |
| Smoking status (n (%)) | |||
| Yes | 164 (41.0%) | 148 (37.0%) | 0.383 |
| No | 236 (59.0%) | 252 (63.0%) | |
| Alcohol consumption (n (%)) | |||
| Yes | 172 (43.0%) | 168 (42.0%) | 0.775 |
| No | 228 (57.0%) | 232 (58.0%) | |
| Kellgren–Lawrence grading | |||
| 2 | 218 (54.5%) | 0 | |
| 3 | 101 (25.3%) | 0 | |
| 4 | 81 (20.3%) | 0 |