Table 1.
Patient demographic data
| Before routine IOUS (1991-1997) | Routine IOUS (1998-2006) | P | |
| Patient number (n) | 368 | 276 | |
| Male/Female | 140/228 | 107/169 | 0.85 |
| Age (yr) | 53.3 ± 13.9 | 57.1 ± 13.6 | 0.004 |
| Operative indications, n (%) | 0.73 | ||
| Cholecystolithiasis | 296 (80.4) | 228 (82.6) | |
| Cholecystocholedocholithiasis | 39 (10.6) | 23 (10.5) | |
| Choledocholithiasis | 7 (1.9) | 4 (1.4) | |
| Gallbladder polyp | 22 (6.0) | 11 (4.0) | |
| Others1 | 4 (1.1) | 4 (1.4) | |
| Symptomatic gallstones, n (%) | 284 (77.2) | 220 (79.7) | 0.44 |
| Acute cholecystitis/cholangitis, n (%) | 42 (11.4) | 32 (11.6) | 0.94 |
| Bile duct diameter2 (mm) | 8.9 ± 4.2 | 8.4 ± 3.6 | 0.12 |
1
Other benign processes including chronic cholecystitis and adenomyomatosis, which need whole biopsy of the gallbladder for suspected malignancy.
2
Maximal dimension of the extrahepatic bile duct was measured by drip infusion cholangiography (51%), endoscopic retrograde cholangiography (35%), percutaneous transhepatic cholangiography (4%), magnetic resonance cholangiography (2%), and/or extracorporeal ultrasonography (8%).