Relative survival: A useful tool to assess generalisability in longitudinal studies of health in older persons

Hockey, Richard, Tooth, Leigh and Dobson, Annette (2011) Relative survival: A useful tool to assess generalisability in longitudinal studies of health in older persons. Emerging Themes in Epidemiology, 8 Article number 3. doi:10.1186/1742-7622-8-3


Author Hockey, Richard
Tooth, Leigh
Dobson, Annette
Title Relative survival: A useful tool to assess generalisability in longitudinal studies of health in older persons
Journal name Emerging Themes in Epidemiology   Check publisher's open access policy
ISSN 1742-7622
Publication date 2011
Sub-type Article (original research)
DOI 10.1186/1742-7622-8-3
Open Access Status DOI
Volume 8
Start page Article number 3
Total pages 8
Place of publication United Kingdom
Publisher BioMed Central Ltd.
Collection year 2012
Language eng
Formatted abstract
Background:
Generalisability of longitudinal studies is threatened by issues such as choice of sampling frame, representativeness of the initial sample, and attrition. To determine representativeness, cohorts are often compared with the population of interest at baseline on demographic and health characteristics. This study illustrates the use of relative survival as a tool for assessing generalisability of results from a cohort of older people among whom death is a potential threat to generalisability.

Methods.
The authors used data from the 1921-26 cohort (n = 12,416, aged 70-75 in 1996) of the Australian Longitudinal Study on Women's Health (ALSWH). Vital status was determined by linkage to the National Death Index, and expected deaths were derived using Australian life tables. Relative survival was estimated using observed survival in the cohort divided by expected survival among women of the same age and State or Territory.

Results:
Overall, the ALSWH women showed relative survival 9.5% above the general population. Within States and Territories, the relative survival advantage varied from 6% to 23%. The interval-specific relative survival remained relatively constant over the 12 years (1996-2008) under review, indicating that the survival advantage of the cohort has not diminished over time.

Conclusion:
This study demonstrates that relative survival can be a useful measure of generalisability in a longitudinal study of the health of the general population, particularly when participants are older.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
School of Public Health Publications
 
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Created: Thu, 22 Sep 2011, 09:23:31 EST by Dr Leigh Tooth on behalf of School of Public Health