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).
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.