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Is Self-reported Body Mass Index Less Reliable in Late Life?  
Högskolan i Jönköping, Hälsohögskolan, HHJ. Åldrande - livsvillkor och hälsa. Högskolan i Jönköping, Hälsohögskolan, HHJ, Institutet för gerontologi.
Högskolan i Jönköping, Hälsohögskolan, HHJ. Åldrande - livsvillkor och hälsa. Högskolan i Jönköping, Hälsohögskolan, HHJ, Institutet för gerontologi.ORCID-id: 0000-0001-9042-4832
2010 (engelsk)Konferansepaper, Publicerat paper (Fagfellevurdert)
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.

sted, utgiver, år, opplag, sider
2010.
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URN: urn:nbn:se:hj:diva-12591OAI: oai:DiVA.org:hj-12591DiVA, id: diva2:325364
Konferanse
Nordic Congress of Gerontology
Tilgjengelig fra: 2010-06-18 Laget: 2010-06-18 Sist oppdatert: 2016-06-30

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Dahl, Anna KFransson, Eleonor I

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