authors Alexander Smith, MD, MS, MPH Walter, Louise C Miao, Yinghui Boscardin, W John Covinsky, Kenneth E
has subject area Activities of Daily Living Aged Aged, 80 and over Disability Evaluation Disabled Persons Educational Status Female Frail Elderly Humans Income Longitudinal Studies Male Marital Status Middle Aged Prospective Studies Sex Distribution Socioeconomic Factors United States