Table 1.

Baseline characteristics of entire cohort and each validation set.

Patient characteristics	Total (N = 30)	1st val set (n = 6)	2nd val set (n = 6)	3rd val set (n = 6)	4th val set (n = 6)	5th val set (n = 6)
Age (median, IQR)	40.5 [29.5, 47.5]	42.5 [36.8, 45.2]	41.0 [30.8, 53.5]	27.0 [26.0, 33.2]	47.0 [43.0, 49.5]	40.5 [35.5, 48.5]
Sex (%)
M	16 (53.3)	2 (33.3)	5 (83.3)	6 (100.0)	1 (16.7)	2 (33.3)
F	14 (46.7)	4 (66.7)	1 (16.7)	0 (0.0)	5 (83.3)	4 (66.7)
BMI (median, IQR)	23.8 [23.0, 27.1]	23.9 [23.4, 27.6]	23.2 [22.0, 23.8]	24.6 [22.3, 26.2]	26.8 [24.4, 27.4]	24.9 [21.9, 27.0]
Type of bile duct (%)
I	23 (76.7)	5 (83.3)	5 (83.3)	6 (100.0)	4 (66.7)	3 (50.0)
II	0	0	0	0	0	0
III	3 (10.0)	1 (16.7)	1 (16.7)	0 (0.0)	1 (16.7)	0 (0.0)
IV	3 (10.0)	0 (0.0)	0 (0.0)	0 (0.0)	1 (16.7)	2 (33.3)
V	0	0	0	0	0	0
VI	1 (3.3)	0 (0.0)	0 (0.0)	0 (0.0)	0 (0.0)	1 (16.7)
Number of duct opening (%)
1	24 (80)	5 (83.3)	5 (83.3)	6 (100.0)	4 (66.7)	4 (66.7)
2	6 (20)	1 (16.7)	1 (16.7)	0 (0.0)	2 (33.3)	2 (33.3)
Hospitaled day (median, IQR)	7.0 [6.0, 8.0]	7.5 [7.0, 8.0]	7.0 [6.2, 8.5]	6.5 [5.2, 7.8]	7.5 [5.5, 8.0]	6.0 [6.0, 6.0]

The types of bile ducts: type I, normal type; type II, trifurcation of right anterior, right posterior, and left hepatic duct; type III, right posterior duct draining into left hepatic duct; type IV, early branching of right posterior duct from the common hepatic duct; type V, right posterior duct draining into cystic duct; type VI, other types of variation in bile duct anatomy.

Val validation, IQR interquartile ratio, M male, F female.