The validity of self-reported body mass index in a population-based osteoarthritis study

BMC Musculoskeletal Disorders

Kåre Birger Hagen⁴  Bård Natvig³  Lars Nordsletten²  Nina Østerås⁵  Ida K Haugen¹  Karin Magnusson⁵ 

[1]Department of Rheumatology, Diakonhjemmet Hospital, Post box 23, Vinderen, 0319 Oslo, Norway

[2]Orthopaedic Department, Oslo University Hospital, 0407 Oslo, Norway

[3]Department of General Practice, Institute of Health and Society, University of Oslo, Post box 1130, Blindern, 0318 Oslo, Norway

[4]Department of Health Sciences, Institute of Health and Society, University of Oslo, Post box 1089, Blindern, 0317 Oslo, Norway

[5]National Advisory Unit on Rehabilitation in Rheumatology, Department of Rheumatology, Diakonhjemmet Hospital, Post box 23, Vinderen, 0319 Oslo, Norway

关键词: Validity;    Age;    Osteoarthritis;    Self-report;    Obesity;    Body mass index;   

Others  :  1090326
DOI  :  10.1186/1471-2474-15-442

 received in 2014-07-30, accepted in 2014-12-09,  发布年份 2014

【 摘 要 】

Background

Obesity is a well-known risk factor for osteoarthritis (OA). The majority of obesity research in OA is performed using self-reported BMI-data, however, its validity in persons with OA is unknown. The aim of this study was to compare the validity of self-reported body mass index (BMI) in persons with and without clinical osteoarthritis (OA) in a population-based survey.

Methods

Height and weight were self-reported, and thereafter measured in 600 persons with and without clinical OA according to the American College of Rheumatology-criteria (knees, hips and/or hands). We compared the differences between measured and self-reported heights, weights and BMIs (kg/m²) for the two groups and explored whether demographic/clinical factors were associated with inaccurate reporting in the OA patients using multivariate linear regression analyses.

Results

Mean (SD) age was 64 (8.7) years and 412 (69%) were women. Participants with clinical OA (n = 449) underreported their BMI to a greater extent than participants without clinical OA (n = 151) [mean (SD) difference 1.34 (1.68) kg/m² and 0.78 (1.40) kg/m² (p = 0.000), respectively]. There was a strong dose-dependent association between higher measured BMI and greater underreporting of BMI in multivariate analyses (BMI 25–29.99 kg/m²: B = 0.40, 95% CI, 0.06, 0.77), BMI ≥ 30 kg/m²: B = 1.30, 95% CI, 0.86, 1.75) in the clinical OA patients. A higher age as well as the time interval from self-reported to measured BMI-data were associated with inaccurate reporting.

Conclusions

Researchers using self-reported height and weight data should be aware of limited agreement with actual height and weight in overweight and obese individuals with clinical OA.

【 授权许可】

   
2014 Magnusson et al.; licensee BioMed Central.

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