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Centre for Policy on Ageing | |
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Another look at aggregate changes in severe cognitive impairment
— further investigation into the cumulative effects of three survey design issues | | Author(s) | Vicki A Freedman, Hakan Aykan, Linda G Martin |
| Journal title | Journals of Gerontology: Series B, Psychological Sciences and Social Sciences, vol 57B, no 2, March 2002 |
| Pages | pp S126-S131 |
| Keywords | Over 70s ; Mental disorder ; Nursing homes ; Methodology ; Longitudinal surveys ; United States of America. |
| Annotation | The study explored whether previously reported declines in severe cognitive impairment were robust to cumulative effects of potentially confounding survey design issues. The 1993 Asset and Health Dynamics of the Oldest Old study (AHEAD, n=7,443) and the 1998 Health and Retirement Survey (HRS, n=7,624), the proportion of those aged 70+ with severe cognitive impairment was calculated under various assumptions about item non-response, differential loss to follow-up, and the size and composition of the nursing home population. Impairment was measured for self-respondents, using a modified version of the Telephone Interview Cognitive Screen; ratings of memory and judgment were used for proxy respondents. Ignoring loss to follow-up, excluding nursing home residents, and assigning a low score to those refusing sub-scales yielded a statistically significant decline in severe cognitive impairment from 5.8% in 1993 to 3.8% in 1998. When cumulative effects of survey design issues were considered and design effects incorporated into statistical tests, statistically significant declines persisted, albeit at a reduced average annual rate, ranging from 2.5% to 6.9% per year. (RH). |
| Accession Number | CPA-020614215 A |
| Classmark | BBK: E: LHB: 3D: 3J: 7T |
Data © Centre for Policy on Ageing |
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| ...from the Ageinfo database published by Centre for Policy on Ageing. |
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