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Großschädl, F; Haditsch, B; Stronegger, WJ.
Validity of self-reported weight and height in Austrian adults: sociodemographic determinants and consequences for the classification of BMI categories.
Public Health Nutr. 2012; 15(1):20-27
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Autor/innen der Med Uni Graz:
Großschädl Franziska
Stronegger Willibald
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Abstract:
Objective: Epidemiological studies have shown that adults tend to underestimate their weight and overestimate their height. This may lead to a misclassification of their BMI in studies based on self-reported data. The aim of the present study was to assess the validity of self-reported weight and height in Austrian adults. Design: Data on weight, height, health behaviour and sociodemographic characteristics of adults were collected in a standardized procedure via a self-filling questionnaire and a medical examination including measurements of weight and height. Setting: A publicly accessible out-patient clinic in southern Austria. Subjects: Austrian residents (n473) aged 18 years and older who attended a health check participated in the study. Results: The mean difference between reported and measured BMI was not significant in younger adults (<35 years: mean difference -0.21 kg/m(2); P < 0.08) but increased significantly with age (>= 55 years: mean difference -0.68 kg/m(2); P<0.001). The prevalence of normal weight (BMI = 18.5-24.9 kg/m(2)) and overweight (BMI = 25.0-29.9 kg/m(2)) was overestimated based,on the self-reported data on BMI, while that for underweight (BMI < 18.5 kg/m(2)) and obesity (BMI >= 30.0 kg/m(2)) was underestimated (P < 0.001). The self-reported data showed an obesity prevalence of 12.5%, while measurement showed a prevalence of 15.4% (P < 0.001). Conclusions: Our results indicate that prevalence rates of obesity are probably underestimated for Austrian adults when using self-reported weight and height information. The deviations from the measured data clearly increased with age. Analyses based on self-reported data should therefore be adjusted for the age dependency of the validity.
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Adult -
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Body Height -
Body Mass Index -
Body Weight -
European Continental Ancestry Group -
Female -
Humans -
Male -
Middle Aged -
Obesity - epidemiology
Outpatients -
Prevalence -
Reproducibility of Results -
Self Report -
Socioeconomic Factors -
Thinness - epidemiology

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