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Logo of nihpaAbout Author manuscriptsSubmit a manuscriptNIH Public Access; Author Manuscript; Accepted for publication in peer reviewed journal;
Am J Health Promot. Author manuscript; available in PMC Oct 14, 2009.
Published in final edited form as:
PMCID: PMC2761600
NIHMSID: NIHMS149824
Computer-Mediated Intervention Tailored on Transtheoretical Model Stages and Processes of Change Increases Fruit and Vegetable Consumption Among Urban African-American Adolescents
Jennifer Di Noia, PhD, Isobel R. Contento, PhD, and James O. Prochaska, PhD
Jennifer Di Noia, Associate Research Scientist at Columbia University School of Social Work, New York, New York;
Send reprint requests to Jennifer Di Noia, PhD, Columbia University School of Social Work, 1255 Amsterdam Ave., New York, NY 10027; jd201/at/columbia.edu
Abstract
Purpose
To examine the efficacy of an intervention based on the transtheoretical model (TTM) for increasing fruit and vegetable consumption among economically disadvantaged African-American adolescents.
Design
Pretest-posttest quasi-experimental study.
Setting
Youth services agencies located in New York, New Jersey, and Pennsylvania. Agencies were assigned to computer intervention (CIN) and nonintervention control study arms.
Subjects
A total of 507 African-American adolescents ages 11 to 14 years.
Intervention
Youths in the CIN arm completed four 30-minute intervention sessions tailored on TTM stages and processes of change.
Measures
Self-reported fruit and vegetable consumption and stages, pros, cons, and self-efficacy for consumption.
Analysis
Intervention effects were examined with analysis of covariance models that were controlled for demographic variables and baseline measures of each outcome. Chi-square analyses were used to examine between-arm differences in youths’ stage progressions.
Results
After adjustment by covariates, pros (p < .025) and fruit and vegetable consumption (p < .001) varied significantly with study arm. Youths in the CIN arm had higher pro scores and fruit and vegetable consumption than controls. More youths in the CIN arm than in the control arm progressed to later stages and maintained recommended intake levels (p < .05).
Conclusions
A TTM-based intervention can increase fruit and vegetable intake and effect positive changes in TTM variables related to intake among economically disadvantaged African-American adolescents.
Keywords: Fruit and vegetable consumption, Transtheoretical Model, African-Americans, Adolescents, Dietary Intervention, Prevention Research, Manuscript format: research, Research purpose: intervention testing, Study design: quasi-experimental, Outcome measure: cognitive, behavioral, Setting: local community, Health focus: nutrition, Strategy: education, skill building/behavior change, Target population: youth, Target population circumstances: geographic location, race/ethnicity