Table 3.
Univariate analysis of the factors related to the detectability of common bile duct stones by multidetector computed tomography n (%)
| Factors | Detectable (n = 111) | Undetectable (n = 19) | P value |
| Age (yr) | 68.3 ± 14.2 | 58.0 ± 16.2 | 0.009 |
| Male sex | 58 (52) | 9 (47) | 0.966 |
| Accompanying GB stones | 43 (39) | 11 (58) | 0.117 |
| Previous cholecystectomy | 28 (25) | 3 (16) | 0.561 |
| Previous sphincterotomy | 13 (12) | 0 (0) | 0.213 |
| Black or mixed stone | 57 (51) | 4 (21) | 0.009 |
| Stone size (mm) | 9.1 ± 4.8 | 4.3 ± 2.9 | < 0.001 |
| CBD diameter (mm) | 12.4 ± 4.6 | 9.2 ± 3.5 | 0.005 |
| WBC (× 109/L) | 10.9 ± 6.01 | 9.86 ± 3.07 | 0.251 |
| Alanine aminotransaminase (IU/L) | 210 ± 250 | 250 ± 208 | 0.513 |
| Total bilirubin (mg/dL) | 3.8 ± 3.9 | 3.3 ± 2.8 | 0.565 |
| Alkaline phosphatase (IU/L) | 215 ± 153 | 209 ± 114 | 0.862 |
| γ-glutamyl transferase (IU/L) | 412 ± 342 | 500 ± 465 | 0.327 |
CBD: Common bile duct; WBC: White blood cell.