Combination of serum gamma-glutamyltransferase and alkaline phosphatase in predicting the diagnosis of asymptomatic choledocholithiasis secondary to cholecystolithiasis

Table 2 Comparison of serum liver function indexes

Variable	Observation group, n = 151	Control group, n = 678	t-value	P-value
ALT, U/L	35.04 ± 9.18	33.22 ± 9.71	0.354	0.803
AST, U/L	38.96 ± 10.65	36.52 ± 10.33	0.289	0.834
TBIL, μmol/L	11.58 ± 2.87	9.99 ± 1.93	0.417	0.682
DBIL, μmol/L	5.56 ± 0.77	4.95 ± 0.64	0.392	0.786
GGT, U/L	154.56 ± 39.53	35.98 ± 8.19	35.721	0.000
ALP, U/L	171.51 ± 41.74	139.49 ± 36.64	7.317	0.000

ALT: Alanine aminotransferase; AST: Aspartate aminotransferase; TBIL: Total bilirubin; DBIL: Direct bilirubin; GGT: Gamma-glutamyltransferase; ALP: Alkaline phosphatase.