Understanding ageing: An evaluation of research designs for assessing the interdependence of ageing-related changes

Scott Hofer, Martin J. Sliwinski

Research output: Contribution to journalArticle

206 Citations (Scopus)

Abstract

Background: Cross-sectional studies of samples varying widely in age have found moderate to high levels of shared age-related variance among measures of cognitive and physiological capabilities, leading researchers to posit common factors or common causal influences for diverse age-related phenomenon. Objective: The influence of population average changes with age on cross-sectional estimates of association has not been widely appreciated in developmental and ageing research. Covariances among age-related variables in cross-sectional studies are highly confounded in regards to inferences about associations among rates of change within individuals since covariances can result from a number of sources including average population age-related differences (fixed age effects) in addition to initial individual differences and individual differences in rates of ageing (random age effects). Analysis of narrow age-cohort samples may provide a superior analytical basis for testing hypotheses regarding associations between rates of change in cross-sectional studies. Conclusions: The use of age-heterogeneous cross-sectional designs for evaluating interdependence of ageing-related processes is discouraged since associations will not necessarily reflect individual-level correlated rates of change. Typical cross-sectional studies do not provide sufficient evidence for the interdependence of ageing-related changes and should not serve as the basis for theories and hypotheses of ageing. Reanalyzing existing cross-sectional studies using a sequential narrow-age cohort approach provides a useful alternative for evaluating associations between ageing-related changes. Longitudinal designs, however, provide a much stronger basis for inference regarding associations between rates of ageing within individuals.

Original languageEnglish (US)
Pages (from-to)341-352
Number of pages12
JournalGerontology
Volume47
Issue number6
DOIs
StatePublished - 2001
Externally publishedYes

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Keywords

  • Ageing
  • Cognition
  • Methodology

ASJC Scopus subject areas

  • Aging

Cite this

Understanding ageing : An evaluation of research designs for assessing the interdependence of ageing-related changes. / Hofer, Scott; Sliwinski, Martin J.

In: Gerontology, Vol. 47, No. 6, 2001, p. 341-352.

Research output: Contribution to journalArticle

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