Hospital use by the aging population.
D000367:Age Factors; D000368:Aged; D002391:Catchment Area, Health; D003710:Demography; D003953:Diagnosis-Related Groups; D005260:Female; D006760:Hospitalization; D006761:Hospitals / Q000706:statistics & numerical data*; D006801:Humans; D008297:Male; D006278:Medicare / Q000706:statistics & numerical data; D008824:Michigan; D008962:Models, Theoretical; D012044:Regression Analysis; D012737:Sex Factors