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Centre for Policy on Ageing | |
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| Practice and drop-out effects during a 17-year longitudinal study of cognitive aging | | Author(s) | Patrick Rabbitt, Peter Diggle, Fiona Holland |
| Journal title | Journals of Gerontology: Series B, Psychological Sciences and Social Sciences, vol 59B, no 2, March 2004 |
| Pages | pp P84-P98 |
| Source | http://www.geron.org |
| Keywords | Mental ageing ; Memory and Reminiscence ; Learning capacity ; Testing ; Longitudinal surveys ; Newcastle upon Tyne ; Greater Manchester. |
| Annotation | Interpretations of longitudinal studies of cognitive aging are misleading, unless effects of practice and selective drop-out are considered. A random effects model taking practice and drop-out into account analysed data from four successive presentations of each of two intelligence tests, two vocabulary tests, and two verbal memory tests during a 17-year longitudinal study of 5,899 active community residents from Newcastle-upon-Tyne and Greater Manchester who ranged in age from 49 to 92 on entry. On intelligence tests, substantial practice effects counteracted true declines observed over 3 to 5 years of ageing and remained significant even with intervals of 7 years between successive assessments. Adjustment for practice and drop-out revealed accelerating decline in fluid intelligence and cumulative learning, linear declines in verbal free recall, and no substantial change in vocabulary. Socioeconomic status and basic levels of general fluid ability did not affect rates of decline. After further adjustment for demographics, variability between individuals was seen to increase as the sample aged. (RH). |
| Accession Number | CPA-040705216 A |
| Classmark | D6: DB: DE: 3T: 3J: 86A: 83 |
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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