Concordance between both methods was analyzed by absolute agreement, weighted kappa, and Bland-Altman statistics. Concurrent validity was assessed by ICC and Spearman correlation coefficient between moderate to vigorous PA (MVPA) derived by the PAU-7S and by accelerometer. Test-retest reliability was determined by intra-class correlation (ICC). Cronbach alpha was calculated for internal consistency. Weight, height, and waist circumference were measured. MethodsĪ randomized sample of 321 healthy children aged 8–16 years (149 boys, 172 girls) from the nationwide representative PASOS study completed the PAU-7S before and after wearing an accelerometer for at least 7 consecutive days. The effect of linear calibration on PAU-7S validity was tested. The aim of this study was to determine test-retest reliability, internal consistency, and the concurrent, construct, and predictive validity of the short semi-quantitative Physical Activity Unit 7 item Screener (PAU-7S), using accelerometry as the reference measurement. Validation of self-reported tools, such as physical activity (PA) questionnaires, is crucial. International Journal of Behavioral Nutrition and Physical Activity volume 18, Article number: 98 ( 2021) Validity, reliability, and calibration of the physical activity unit 7 item screener (PAU-7S) at population scale
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