In sub-analysis of the discriminative capacity between the nomogram and GGT (<300 or ≥ 300), we found that the nomogram was superior to the GGT alone in the preoperative diagnosis of BA.
In comparison to cases with excluded BA, the ones with this disease were significantly associated with absence of duodenal bile traces (98.4 vs. 1.6%, <i>p</i> < 0.001), higher bilirubin (<i>p</i> < 0.001, cutoff 7.3 mg/dL), and higher GGT (<i>p</i> < 0.001, cutoff 250 U/L).