The effect of male gender on the odds of severe attack in patients with acute biliary pancreatitis.

aMultivariable logistic regression using Generalized Estimating Equations models adjusting for age, year of admission, urbanization, hospital level, Charlson Comorbidity Index (0, 1, 2, 3+) and imaging studies (i.e., computed tomography and magnetic resonance imaging).
bPeptic ulcer was forced into the model as an additional covariate because it is a cause of gastrointestinal bleeding.