Frequency Needed for School-based Obesity Intervention

Efficacious school-based interventions have been intensive making it difficult for
interventions to be scaled. The more components there are to an intervention, typically the
better the results. Instead of decreasing intensity via the removal of intervention
components, this randomized controlled trial aimed to compare changes in Mexican-American
adolescent standardized body mass index (zBMI) based on the number of days per week they
received a multi-component intervention. Mexican-American middle school students (n=203) with
overweight or obesity were recruited from an independent school district in Houston. Students
were randomized to receive an obesity intervention with established efficacy zero (control),
one, three, or five days/week. In each condition, 80% of intervention time was allocated to
physical activity and 20% to nutrition. Directly measured height and weight were used to
calculate zBMI.

Inclusion Criteria:

1. BMI-for-age (Body Mass Index) percentile ≥ 85

2. Male or female between ages 10 - 17 years

3. Self-identified as Mexican-American

Exclusion Criteria:

1. Student who is pregnant, planning to become pregnant, or becomes pregnant

2. School report of cognitive impairment significantly below average age and/or grade
level

3. Use of any weight-loss medication (prescription or nonprescription) for at least 6
months prior to screening

4. Type 1 or 2 diabetes medical diagnosis