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| Characteristic | Healthy subjects | Gallstone patients |
| Total | 220 | 230 |
| Age at interview (years) Mean± SD | 49.0±9.8 | 48.6±11.9 |
| Sex | ||
| Male (n%) | 77 (35.0) | 83 (36.1) |
| Female (n%) | 143 (65.0) | 147 (63.9) |
