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. 2016 Mar 29;113(13):3488-91.
doi: 10.1073/pnas.1518443113. Epub 2016 Mar 14.

Impacts of classifying New York City students as overweight

Douglas Almond  1 , Ajin Lee  2 , Amy Ellen Schwartz  3
Affiliations

Impacts of classifying New York City students as overweight

Douglas Almond et al. Proc Natl Acad Sci U S A. .

Abstract

US schools increasingly report body mass index (BMI) to students and their parents in annual fitness "report cards." We obtained 3,592,026 BMI reports for New York City public school students for 2007-2012. We focus on female students whose BMI puts them close to their age-specific cutoff for categorization as overweight. Overweight students are notified that their BMI "falls outside a healthy weight" and they should review their BMI with a health care provider. Using a regression discontinuity design, we compare those classified as overweight but near to the overweight cutoff to those whose BMI narrowly earned them a "healthy" BMI grouping. We find that overweight categorization generates small impacts on girls' subsequent BMI and weight. Whereas presumably an intent of BMI report cards was to slow BMI growth among heavier students, BMIs and weights did not decline relative to healthy peers when assessed the following academic year. Our results speak to the discrete categorization as overweight for girls with BMIs near the overweight cutoff, not to the overall effect of BMI reporting in New York City.

Keywords: BMI; Fitnessgram; New York City; childhood obesity; regression discontinuity design.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Fig. 1.
Fig. 1.
Regression discontinuity estimates for alternative bandwidths of next year's BMI (A) and weight (B).
See this image and copyright information in PMC

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