| http://www.w3.org/ns/prov#value | - We therefore performed multivariable regression analysis16 using the computer software programs PROC SURVEYREG17 (SAS Inc, Cary, NC) (for LOS and charges) and PROC SURVEYLOGISTIC (SAS) (for mortality), controlling for hospital fixed effects and patient variables such as diagnosis-related group, age, sex, race, and payer, as well as certain comorbidities (diabetes, lung disease, and dialysis) ident
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