Univariate and multivariable association of AP (all-diagnoses) with comorbid conditions.

a<p>Univariate models were constructed using regression analysis of cases with AP based on individual covariates only.</p>b<p>Multivariable models were constructed using regression analysis of cases with AP based on interaction with both demographic parameters and comorbid conditions (age, sex, race, hospital region, median household income, payer type, and year of discharge).