Aged 2 Aged, 80 and over Article 2 Female 2 Humans 2 Male 2 Retrospective Studies 2 United States 2 aged 2 controlled study female 2 human 2 major clinical study 2 male 2 medicare 2 retrospective study 2 very elderly 2 Administrative Claims, Healthcare 1 Adult 1 Alzheimer disease 1 Bronchodilator Agents 1 Case-Control Studies 1 Cohort Studies 1 Cost of Illness 1 Databases, Factual 1 Dementia 1 Health Care Costs 1 Insurance Claim Review 1 Logistic Models 1 Medicare Part C 1