Table 1.

Baseline characteristics.

	Overall	Training set	Test set	P
N	250	225	25
Sex (%)
Male	145 (58.0)	131 (58.2)	14 (56.0)	1
Female	105 (42.0)	94 (41.8)	11 (44.0)
Age	34.4±11.3	34.7±11.2	31.5±12.6	0.231
BMI	23.3±2.9	23.3±2.9	23.4±2.7	0.769
BD type (%)
I	183 (73.2)	165 (73.3)	18 (72.0)	0.523
II	14 (5.6)	12 (5.3)	2 (8.0)
III	35 (14.0)	33 (14.7)	2 (8.0)
IV	14 (5.6)	11 (4.9)	3 (12.0)
V	2 (0.8)	2 (0.9)	0 (0.0)
others	2 (0.8)	2 (0.9)	0 (0.0)

BD type, bile duct type.