Stage of change for physical activity in adolescents considering built environment and psychosocial factors
ISPAH ePoster Library. Aznar Lain S. 10/15/18; 225487; 34
Dr. Susana Aznar Lain
Dr. Susana Aznar Lain
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Abstract
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Abstract The aim of this study was to determine which multifactorial combinations are useful to predict stage of change for physical activity (PA) in adolescents considering together built environment and psychosocial factors.The sample comprised 465 adolescents from the IPEN Adolescent study (Valencia, Spain). Stage of change for PA, physical self-efficacy and social support were measured by questionnaire. PA behavior was objectively measured by accelerometers. Weight and height were measured using standardized protocols, and BMI was calculated (kg/m2). A neighborhood walkability index score was calculated based on Geographic Information System.A classification tree was established using Matlab R2015a program (Mathworks Inc., Natick, USA) to discern adolescents depending on their stage of change (i.e., active and inactive stages) using as input variables the age, gender, neighborhood walkability, BMI percentile, social support, self-efficacy and MVPA.Results indicated that only with a high perception of physical self-efficacy (greater than 4.25), 40% and 33% of students, were classified into the active stages of change (i.e., action and maintenance stages) with an accuracy of 80-90%. Built environment was responsible to classify 21-23% of adolescents (of training and validation dataset, respectively) into active stages of change. Conclusion:<\b>
Multifactorial combinations including social-support for physical activity, self-efficacy perception, neighborhood walkability and MVPA are useful to predict the stages of change in adolescents with an accuracy of 84.72%. External funding details This work was supported partially by Generalitat Valenciana, Spain [grant number GV-2013-087]
Abstract The aim of this study was to determine which multifactorial combinations are useful to predict stage of change for physical activity (PA) in adolescents considering together built environment and psychosocial factors.The sample comprised 465 adolescents from the IPEN Adolescent study (Valencia, Spain). Stage of change for PA, physical self-efficacy and social support were measured by questionnaire. PA behavior was objectively measured by accelerometers. Weight and height were measured using standardized protocols, and BMI was calculated (kg/m2). A neighborhood walkability index score was calculated based on Geographic Information System.A classification tree was established using Matlab R2015a program (Mathworks Inc., Natick, USA) to discern adolescents depending on their stage of change (i.e., active and inactive stages) using as input variables the age, gender, neighborhood walkability, BMI percentile, social support, self-efficacy and MVPA.Results indicated that only with a high perception of physical self-efficacy (greater than 4.25), 40% and 33% of students, were classified into the active stages of change (i.e., action and maintenance stages) with an accuracy of 80-90%. Built environment was responsible to classify 21-23% of adolescents (of training and validation dataset, respectively) into active stages of change. Conclusion:<\b>
Multifactorial combinations including social-support for physical activity, self-efficacy perception, neighborhood walkability and MVPA are useful to predict the stages of change in adolescents with an accuracy of 84.72%. External funding details This work was supported partially by Generalitat Valenciana, Spain [grant number GV-2013-087]
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