Reliability and validity of questionnaire measures of sedentary time in adolescents
Mahar, Thomas Francis
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The purpose of this study was to examine the reliability and validity of questionnaire estimates of sedentary time in adolescents. Adolescents (n=98) completed Youth Risk Behavior Survey (YRBS) sedentary items and the Adolescent Sedentary Activity Questionnaire (ASAQ) twice. Actigraph GT3X+ accelerometers were used to obtain an objective measure of sedentary time as the criterion measure. Results indicated acceptable levels of reliability for the YRBS TV time item (rho=.82), but a lower estimate for the computer/video game item (rho=.68). When examined for the entire week, reliability estimates for all categories of the ASAQ were acceptable (R≥.70), except for the education and travel categories. Validity evidence of the ability of the questionnaires to estimate accelerometer-determined sedentary time was poor (r ≤.16; Spearman’s rho≤.15). In conclusion, the YRBS sedentary items and the ASAQ demonstrated moderate to good evidence of reliability and poor evidence of validity for measuring sedentary time in adolescents.