List of Abbreviations
| ADL | activities of daily living |
| AHEAD | Assets and Health Dynamics of the Oldest Old |
| AoA | Administration on Aging |
| BMI | body mass index |
| CDC | Centers for Disease Control and Prevention |
| CMS | Centers for Medicare and Medicaid Services |
| HRS | Health and Retirement Study |
| IADL | instrumental activities of daily living |
| ICF | International Classification of Functioning, Disability and Health (formerly ICIDH) |
| NHIS-D | National Health Interview Survey on Disability |
| NIA | National Institute on Aging |
| TICS | Telephone Interview for Cognitive Status |
| WHO | World Health Organization |


