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Agreement between self-reported and measured height, weight and body mass index in old age--a longitudinal study with 20 years of follow-up.

Artikel i vetenskaplig tidskrift
Författare Anna K Dahl
Linda Hassing
Eleonor I Fransson
Nancy L Pedersen
Publicerad i Age and ageing
Volym 39
Nummer/häfte 4
Sidor 445-51
ISSN 1468-2834
Publiceringsår 2010
Publicerad vid Psykologiska institutionen
Sidor 445-51
Språk en
Länkar dx.doi.org/10.1093/ageing/afq038
Ämneskategorier Dermatologi och venereologi, Folkhälsomedicinska forskningsområden

Sammanfattning

BACKGROUND: 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. OBJECTIVE: the study aimed to evaluate the accuracy and changes in accuracy of self-reported height, weight and BMI calculated from self-reported height and weight in late life. DESIGN: a longitudinal population-based study with five times of follow-up was conducted. Participants: seven hundred seventy-four community-living men and women, aged 40-88 at baseline (mean age 63.9), included in The Swedish Adoption/Twin Study of Aging. METHODS: participants self-reported their height and weight in a questionnaire, and height and weight were measured by experienced research nurses at an in-person testing five times during a 20-year period. BMI was calculated as weight (kilogramme)/height (metre)(2). RESULTS: latent growth curve modelling showed an increase in the mean difference between self-reported and measured values over time for height (0.038 cm/year) and BMI (0.016 kg/m(2)/year), but not for weight. CONCLUSIONS: there is a very small increase in the mean difference between self-reported and measured BMI with ageing, which probably would not affect the results when self-reported BMI is used as a continuous variable in longitudinal studies.

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