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Is Self-reported Body Mass Index Less Reliable in Late Life?  
Jönköping University, School of Health Science, HHJ. Ageing - living conditions and health. Jönköping University, School of Health Science, HHJ, Institute of Gerontology.
Jönköping University, School of Health Science, HHJ. Ageing - living conditions and health. Jönköping University, School of Health Science, HHJ, Institute of Gerontology.ORCID iD: 0000-0001-9042-4832
2010 (English)Conference paper, (Refereed)
Abstract [en]

Objectives: Self-reported Body Mass Index (BMI) based on self-reported height and weight is a widely used measure of adiposity in epidemiological research. Knowledge about the accuracy of these measures in late life is scarce, and especially if there is intra-individual changes over time.

Methods: Seven hundred seventy-four men and women, aged 40 to 88 at baseline (mean age 63.9), in The Swedish Adoption/Twin Study of Aging self-reported and had their height and weight measured by experienced research nurses five times during a twenty year period. BMI was calculated as weight (kilos)/height (meter)2.

Results: There was significant correlation between self-reported and measured height (0.97-0.98), weight (0.97-0.98), and BMI (0.93-0.95) at each measurement occasion, and substantial agreement for BMI as a categorical variable (Kappa coefficient 0.72-0.81). Latent growth curve modeling showed an increase in the mean difference between self-reported and measured values over time for height (0.04 cm/year) and BMI (0.02 kg/m2/year), but not for weight.

Conclusions: There is a very small significant increase in the mean difference between self-reported and measured BMI with aging, mainly due to unawareness of changes in height, which probably would not affect the results when self-reported BMI is used as a continuous variable in longitudinal studies.

Place, publisher, year, edition, pages
2010.
National Category
Other Social Sciences not elsewhere specified
Identifiers
URN: urn:nbn:se:hj:diva-12591OAI: oai:DiVA.org:hj-12591DiVA: diva2:325364
Conference
Nordic Congress of Gerontology
Available from: 2010-06-18 Created: 2010-06-18 Last updated: 2016-06-30

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