Psychosocial Factors Affecting Physical Activity Behaviors of Adolescents in Türkiye: The Theory of Planned Behavior...

PurposeTo investigate the frequency of physical activity behavior among adolescents between the ages of 14-18 and to explain their physical activity behavior within a mixed theory of planned behavior and social cognitive theory model (TPB/SCT) with structural equation modeling.DesignWe investigated the causality of physical activity behavior in adolescents with classical epidemiological regressions models and structural equation models.SettingThe data were stratified by student grade, school type (public/private), and education type (vocational/other).SubjectsThe analyses included data from 1003 students from 31 high schools.Measures & AnalysisFor the "classical epidemiological approach" descriptive, univariate, and multivariate (logistic regression) analyses were presented. For the "structural approach", based on the mixed model of TPB/SCT, 10 structural equation models were established, with stratum of gender and socioeconomic status of the participants.ResultsOur results confirm the hypothesis that attitudes of adolescents - except in poor male adolescents - (β min-max: 0.39-0.46) and perceived behavioral control (β min-max: 0.27-0.39) predicts "intention," while intention (β min-max: 0.39-0.46) predicts physical activity "behavior." The barriers significantly reduce physical activity, especially in wealthy male adolescents (β: -0.12), and peer support significantly increases physical activity in all models (β min-max: 0.21-0.28) except for poor female adolescents. Our models explained approximately 60.0% of physical activity intention variance and approximately 45.0% of physical activity behavior variance. In addition, the lowest values of these two variance percentages were calculated (54.0% and 28.0%) among poor female adolescents.ConclusionOur model could be applied to understand physical activity behavior in adolescents, and still three out of every four adolescents are not physically active at recommended levels. Psychological theories have not yet been able to adequately explain the physical activity behavior of poor female students. According to structural equation modeling, peer social support was found to be twice as effective as parental social support.