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To determine the test–retest reliability of a self-report questionnaire (the Adolescent Sedentary Activities Questionnaire; ASAQ) which assesses the time spent in a comprehensive range of sedentary activities, among school-aged young people.

Two-hundred and fifty school students aged 11–15 years from four primary and four high schools in metropolitan Sydney (New South Wales, Australia) completed the questionnaire under the same conditions on two occasions, 2 weeks apart during Autumn, 2002.

Test–retest correlations for time total spent in sedentary behavior were ≥0.70, except for Grade 6 boys (Intraclass correlation coefficient (ICC)=0.57, 95%CI: 0.25, 0.76). Repeatability was generally higher on week days compared with week end days. ICC values for travel and social activities tended to be lower than for the other categories of sedentary behavior. There was little …