Table 1.
Baseline characteristics according to gallstone and cholecystectomy
| Characteristic | Total | No gallstone | Gallstone | P-valuea | No cholecystectomy | Cholecystectomy | P-valuea |
|---|---|---|---|---|---|---|---|
| Total | 704,437 (100.0) | 687,270 (97.6) | 17,167 (2.4) | 687,270 (97.6%) | 9,910 (1.4) | ||
| Follow-up (yr) | 7.4 ± 3.6 | 7.3 ± 3.6 | 3.5 ± 2.5 | < 0.01 | 7.5 ± 3.6 | 3.2 ± 2.2 | < 0.01 |
| Age (yr)b | 41.7 ± 14.7 | 41.5 ± 14.7 | 48.5 ± 14.9 | < 0.01 | 41.5 ± 14.7 | 47.1 ± 14.6 | < 0.01 |
| Sex | 0.06 | 0.39 | |||||
| Male | 345,775 (49.1) | 337,227 (49.1) | 8,548 (49.8) | 337,227 (49.1) | 4,906 (49.5) | ||
| Female | 358,662 (50.9) | 350,043 (50.9) | 8,619 (50.2) | 350,043 (50.9) | 5,004 (50.5) | ||
| Comorbidity | |||||||
| Diabetes | 71,440 (10.1) | 68,064 (9.9) | 3,376 (19.7) | < 0.01 | 68,064 (9.9) | 1,812 (18.3) | < 0.01 |
| Viral hepatitis | 10,457 (1.5) | 9,981 (1.5) | 476 (2.8) | < 0.01 | 9,981 (1.5) | 250 (2.5) | < 0.01 |
| Cirrhosis | 15,854 (2.3) | 2,440 (0.4) | 277 (1.6) | < 0.01 | 2,440 (0.4) | 87 (0.9) | < 0.01 |
| Fatty liver disease | 23,637 (3.4) | 22,440 (3.3) | 1,197 (7.0) | < 0.01 | 22,440 (3.3) | 616 (6.2) | < 0.01 |
| Clonorchis sinensis | 204 (0.0) | 200 (0.0) | 4 (0.0) | 0.66 | 200 (0.0) | 2 (0.0) | 0.61 |
Values are presented as number (%) or mean ± SD. aThe chi-square test for categorical values and the t-test for continuous values. bAge at study entry.