Table 4. Effectiveness of risk stratification based on the screen model and clay stool of biliary atresia in derivation and validation cohort.

Biliary atresia screen method	Cutoffs	Derivation cohort (n=227)					Validation cohort (n=234)
		No. of cholestatic infants classified into each risk group, N (%)	No. of biliary atresia classified into each risk group, N (%)	Detection rate of biliary atresia in each risk group (%)	Detection rate of biliary atresia in the total population (%)		No. of cholestatic infants classified into each risk group, N (%)	No. of cases classified into each risk group, N (%)	Detection rate of esophageal high-grade lesions in each risk group (%)	Detection rate of biliary atresia in the total population (%)
High risk group in the screen model	≥0.49998	77 (33.9)	66 (80.5)	85.7	82/227 (36.1)		85 (36.3)	72 (80.0)	84.7	90/234 (38.5)
Intermediate risk group in the screen model	<0.49998, >0.05317	83 (36.6)	16 (19.5)	19.3			85 (36.3)	18 (20.0)	21.2
Low risk group in the screen model	≤0.05317	67 (29.5)	0	0			64 (27.3)	0	0
Clay-colored stools in the total population	Presence	71 (31.3)	42 (51.2)	59.2			62 (26.5)	35 (38.9)	56.5