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Centre for Policy on Ageing | |
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Left-truncated data with age as time scale
— an alternative for survival analysis in the elderly population | | Author(s) | Rosa Lamarca, Jordi Alonso, Guadalupe Gómez, |
| Journal title | The Journals of Gerontology Series A: Biological Sciences and Medical Sciences, vol 53A, no 5, September 1998 |
| Pages | pp M337-M343 |
| Keywords | Longevity ; Age group distribution statistics ; Death rate [statistics] ; Longitudinal surveys ; Spain. |
| Annotation | The standard approach for survival analysis of an older population is to define the survival time as the elapsed time from study entry until death, and to adjust by age using stratification and regression procedures. However, our interest is in studying the ageing process and its related risk factors, not the use of time-on-study as the time scale. In this study, 1,315 over 65s in Barcelona were interviewed in 1986, of whom 805 (61.2%) were documented as alive at follow-up in October 1994, 452 (34.4%) had died, and 58 (4.6%) were lost or not traced. To illustrate the usefulness of age as time scale (alternative approach) instead of time-on-study in analysing the surviving population, both methods were used to assess the relationship between functional capacity at baseline and mortality. Using the alternative approach, it was observed that 50% of the sample died at age 80.6 years; this information could not be estimated using the standard approach. Although use of standard survival analysis generally produces correct estimates, the use of age as time scale is deemed more appropriate for analysing survival of older people. (RH). |
| Accession Number | CPA-990225222 A |
| Classmark | BGA: S6: S5: 3J: 76S |
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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