Multivariate logistic regression of these factors found that people over 55 years of age are 5.19 times more likely to be diagnosed with choledocholithiasis by ERCP than younger patients, patients with elevated direct bilirubin are 4.98 times more likely to be diagnosed with choledocholithiasis by ERCP than patients without elevated direct bilirubin, and patients with direct bilirubin greater than 30% of total bilirubin are 9.73 times more likely to be diagnosed with choledocholithiasis by ERCP than patients with lower ratios.
Todos estos factores fueron sometidos al análisis de regresión logística multivariado encontrándose que la edad > 55 años, la bilirrubina directa elevada y la relación de la bilirrubina directa mayor de 30% de la bilirrubina total son predictores independientes de coledocolitiasis en la CPRE, estimando un riesgo de 5,19 veces, 4,98 veces y 9,73 veces respectivamente.