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Regression models to predict corrected weight, height and obesity prevalence from self-reported data: data from BRFSS 1999–2007

International Journal of Obesity volume 34, pages 1655–1664 (2010)Cite this article

Subjects

Abstract

Background:

Surveys such as the Behavioral Risk Factor Surveillance System (BRFSS) collect only self-reported data on height and weight to estimate obesity prevalence rates. Because of biased self-reporting of height and weight, obesity prevalence rates reported by these surveys are too low.

Objective:

To develop regression models that can predict corrected height, weight and obesity prevalence from self-reported data, as well as to compare obesity prevalence rates based on self-reported and modeled data and test for trends in obesity prevalence by gender, age and race/ethnicity.

Design:

Data from the National Health and Nutrition Examination Survey (NHANES) for the period 1999–2006 were used to develop regression models to predict corrected height, weight and obesity prevalence. Regression coefficients estimated from these models were used to predict corrected height, weight and obesity prevalence for BRFSS data for 1999–2007.

Results:

Self-reported weights for males were higher by 0.1–0.2 kg and lower by about 1.25 kg than corrected weights for females. Underreporting of weights was lowest for Hispanics when compared with other race/ethnicities. In addition, underreporting of weight increased with an increase in body mass index. Self-reported heights for males were higher than corrected heights by about 2 cm, and for females, by about 1 cm. Overreporting of height increased with an increase in age. Self-reported obesity prevalence was 4.5–5.8% lower than corrected rates for males and by 4.4–5.1% for females. Underreporting of obesity prevalence increased with an increase in age. Obesity prevalence rates increased over time for each gender, race/ethnicity and age group for BRFSS data.

Conclusion:

Obesity prevalence calculated from self-reported data is too low and should be used with caution for health-care planning purposes. When it is not possible to have measured data, corrected heights and weights may be predicted by using models such as those presented by us from a relatively large data set that has both measured and self-reported data.

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Acknowledgements

We gratefully acknowledge the contributions of two anonymous referees who not only thoroughly reviewed an earlier version of this paper but also provided many constructive comments that substantially improved the regression models that we present in this paper.

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  1. National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA, USA

    R B Jain

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Correspondence to R B Jain.

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The findings and conclusions in this article are those of the authors and do not necessarily represent the views of the Centers for Disease Control and Prevention.

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Jain, R. Regression models to predict corrected weight, height and obesity prevalence from self-reported data: data from BRFSS 1999–2007. Int J Obes 34, 1655–1664 (2010). https://doi.org/10.1038/ijo.2010.80

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