Table 1 Comparison of patients with and without postoperative intrahepatic bile duct stones
|  | IHBD stone (+) | IHBD stone (−) |  |
|---|---|---|---|
n = 12 | n = 105 | p | |
Sex (F/M) | 9 / 3 | 74 / 31 | 1.00 |
Median age at surgery for CBD (range) | 1 year (1 month - 4 years) | 3 years (14 days - 17 years) | 0.02 |
Todani classification | Â | Â | Â |
 Ia | 4 | 39 | 1.00 |
 Ic | 0 | 31 | 0.03 |
 IVa | 7 | 23 | 0.01 |
no dilatation | 1 | 5 | 0.49 |
Median follow period (range) | 16.5 years (5–39 years) | 22 years (1–39 years) | 0.47 |