Correction of self-reported BMI based on objective measurements: a Belgian experience

نویسندگان

  • S. Drieskens
  • S. Demarest
  • S. Bel
  • K. De Ridder
  • J. Tafforeau
چکیده

Background Based on successive Health Interview Surveys (HIS), it has been demonstrated that also in Belgium obesity, measured by means of a self-reported body mass index (BMI in kg/m2), is a growing public health problem that needs to be monitored as accurately as possible. Studies have shown that a self-reported BMI can be biased. Consequently, if the aim is to rely on a self-reported BMI, adjustment is recommended. Data on measured and self-reported BMI, derived from the Belgian Food Consumption Survey (FCS) 2014 offers the opportunity to do so. Methods The HIS and FCS are cross-sectional surveys based on representative population samples. This study focused on adults aged 18-64 years (sample HIS = 6545 and FCS = 1213). Measured and self-reported BMI collected in FCS were used to assess possible misreporting. Using FCS data, correction factors (measured BMI/self-reported BMI) were calculated in function of a combination of background variables (region, gender, educational level and age group). Individual self-reported BMI of the HIS 2013 were then multiplied with the corresponding correction factors to produce a corrected BMI-classification. Results When compared with the measured BMI, the self-reported BMI in the FCS was underestimated (mean 0.97 kg/m2). 28% of the obese people underestimated their BMI. After applying the correction factors, the prevalence of obesity based on HIS data significantly increased (from 13% based on the original HIS data to 17% based on the corrected HIS data) and approximated the measured one derived from the FCS data. Conclusions Since self-reported calculations of BMI are underestimated, it is recommended to adjust them to obtain accurate estimates which are important for decision making.

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Author’s response to reviews Title: Correction of self-reported BMI based on objective measurements: a Belgian experience Authors:

Title: Correction of self-reported BMI based on objective measurements: a Belgian experience Authors: Sabine Drieskens ([email protected]) Stefaan Demarest ([email protected]) Sarah Bel ([email protected]) Karin De Ridder ([email protected]) Jean Tafforeau ([email protected]) Version: 1 Date: 23 Oct 2017 Author’s response to reviews: Comments N Chau (revie...

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عنوان ژورنال:

دوره 76  شماره 

صفحات  -

تاریخ انتشار 2018