Journal Article

Age and Sex Differences in Genetic and Environmental Factors for Self-Rated Health

Pia Svedberg, Paul Lichtenstein and Nancy L. Pedersen

in The Journals of Gerontology: Series B

Volume 56, issue 3, pages S171-S178
Published in print May 2001 | ISSN: 1079-5014
Published online May 2001 | e-ISSN: 1758-5368 | DOI: http://dx.doi.org/10.1093/geronb/56.3.S171
Age and Sex Differences in Genetic and Environmental Factors for Self-Rated Health

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  • Geriatric Medicine
  • Psychology
  • Cognitive Psychology
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Objectives. Self-rated health has been shown to be a predictor for future health status and mortality. The purpose of this study was to investigate age-group and sex differences in genetic and environmental sources of variation for self-rated health.

Methods. A sample of twins from the Swedish Twin Registry participated in a computer-assisted telephone interview with assessment of self-rated health. Structural equation model analyses on 1,243 complete twin pairs provided estimates of genetic and environmental components of variance.

Results. Individual differences primarily reflected individual specific environmental influences at all ages. The increase in total variance across age groups was primarily due to genetic influences in the age groups 45–74 years and greater environmental influences in the oldest age group (>74). No significant sex differences were found in variance components.

Discussion. Genetic variance in the two middle age groups (45–74) could reflect genetic susceptibility to age-dependent illnesses not yet expressed in the youngest group. The findings suggest that it might be more fruitful to explore the origins of individual differences for self-rated health in the context of an individual's age and birth cohort rather than in the context of sex.

Journal Article.  6272 words.  Illustrated.

Subjects: Geriatric Medicine ; Psychology ; Cognitive Psychology ; Gerontology and Ageing

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