Mathematica Policy Research posted a new research brief that summarises findings from a study of Healthy Harlem, an after-school programme aimed at promoting healthy lifestyles. The study, by James Mabli, Martha Bleeker and Mary Kay Fox, showed that participation in the Healthy Harlem programme led to increased physical activity and improved weight status for overweight and obese pupils.
Key components of Healthy Harlem include physical activity, healthy snacks, nutrition education lessons and parent workshops. To assess Healthy Harlem’s effectiveness, the authors monitored pupils at 21 after-school sites during an initial baseline year and then measured programme impacts after two and three years of participation. They collected data through a pupil survey, a fitness test and direct measurements of height and weight. Key findings were as follows:
- A 5.5 percent decrease in mean BMI z-scores after two years of participation and a 9.0 percent decrease after three years of participation. According to the report, a BMI z-score reflects the number of standard deviations a pupil’s BMI is from the mean BMI for a reference population.
- A decrease of 12.2 percentage points in the percentage of pupils who were overweight or obese after two years, and a decrease of 18.4 percentage points after three years.
- An increase in the percentage of pupils considered to be within the Harlem Fitness Zone, a measure of fitness based on a pupil’s ability to complete a minimum number of laps, defined for age-and-gender subgroups.
Source: The impact of Healthy Harlem on the body mass index and weight status of adolescents after two and three Years (March 2018), Mathematica Policy Research