Schwartz article on impacts of classifying NYC students as overweight published in PNAS
Mar 28, 2016
Douglas Almond, Ajin Lee & Amy Ellen Schwartz
Proceedings of the National Academy of Sciences, March 2016
Amy Ellen Schwartz
U.S. schools increasingly report body mass index (BMI) to students and their parents in annual fitness “report cards.” The authors obtained 3,592,026 BMI reports for New York City public school students for 2007–2012. They 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, the authors compare those classified as overweight but near to the overweight cutoff to those whose BMI narrowly earned them a “healthy” BMI grouping.
The authors 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. Their 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.