Two-Year Outcomes of a Primary Care–and Home-Based Intervention for Physical Activity, Sedentary Behavior, and Diet in Adolescents

Objective. Interventions to promote physical activity (PA) and healthy diet that are (a) conducted in a primary care setting, (b) based on theories of behavioral change, and (c) of long duration (>1 year) are recommended but few exist. We tested the effect, after 2 years of treatment, of a multicomponent intervention designed to promote PA and healthy diet among 819 adolescents between the ages of 11 and 15 years from San Diego. Methods. Treatment effects were assessed using sex-specific repeated-measures mixed model analyses. All behaviors measured were based on self-report. Results. After 2 years of treatment, boys in the intervention group maintained improved consumption of fruits and vegetables whereas the control group did not (P = .006). Two-year treatment effects were also observed for sedentary behaviors in both boys (P < .0001) and girls (P = .012). Satisfaction with the program was high and of the intervention components, counselor calls were most liked, parental guidance was perceived as most v...