Ultrasonography surveillance indicators in the <3 and ≥3 groups
| Variable | Total no (%) | <3 group, n (%) | ≥3 group, n (%) | p Value |
| Viral hepatitis (HBV, HCV) | 2580 (55.8) | 1556 (49.4) | 1024 (69.6) | <0.001 |
| Chronic hepatitis (except HBV, HCV) | 1560 (33.8) | 1179 (37.4) | 381 (25.9) | <0.001 |
| Gallbladder diseases | 1690 (36.6) | 989 (31.4) | 701 (47.6) | <0.001 |
| Abdominal pain | 1387 (30.0) | 921 (29.2) | 466 (31.7) | 0.098 |
| KUB diseases | 928 (20.1) | 524 (16.6) | 404 (27.4) | <0.001 |
| Pancreas diseases | 271 (5.9) | 133 (4.2) | 138 (9.4) | <0.001 |
| Others* | 1780 (38.5) | 1085 (34.5) | 695 (47.2) | <0.001 |
*Hepatomegaly, splenomegaly, abdominal or pelvic mass, and ascites.
HBV, hepatitis B virus; HCV, hepatitis C virus; KUB, kidney–urinary–bladder.