Comparison of Height, Weight, and Body Mass Index Data From State‐Mandated School Physical Fitness Testing and a Districtwide Surveillance Project

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BACKGROUND: Approximately one third of California school-age children are overweight or obese. Legislative approaches to assessing obesity have focused on school-based data collection. During 2010-2011, the Chula Vista Elementary School District conducted districtwide surveillance and state-mandated physical fitness testing (PFT) among fifth grade students. We compared height, weight, and body mass index (BMI) to examine measurement differences between the projects. METHODS: We assessed demographic characteristics and BMI category frequencies. We used paired t-tests to test continuous variables. κ statistics were used to assess categorical agreement. RESULTS: Of 3549 children assessed, 69% were Hispanic. Fifty-one percent were boys. Mean heights, weights, and BMIs were significantly different for each project (p < .0001). Surveillance height (106.7-165.1 cm) and weight (21.6-90.8 kg) ranges were lesser than PFT ranges (109.2-180.3 cm and 22.7-98.4 kg). The overall BMI category agreement was good (weighted κ = 0.77). Categorical percentage agreement was highest among normal weight children (94.9%) and lowest among underweight children (56.6%). CONCLUSIONS: Methodological differences might have resulted in the observed height, weight, and BMI differences. As school-based interventions become common, districts should carefully consider measurement reliability, training, and data-handling protocols to have confidence in their findings.