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Prevalence of previous history of cholecystectomy and sonographically detected gallstones among males and females
| History of cholecystectomy (%) | Ultrasound diagnosis of gallstones (%) | Total (%) | |
| Males | 122 (6.8) | 160 (8.7) | 282 (14.4) |
| Females | 257 (16.1) | 198 (12.9) | 455 (25.3) |
| All | 379 (11.2) | 358 (10.6) | 737 (19.7) |
