Schröder, HelmutSubirana, IsaacWärnberg, JuliaMedrano Echeverría, MaríaGonzález Gross, MarcelaGusi, NarcísAznar, SusanaAlcaraz, Pedro E.González Valeiro, Miguel A.Serra-Majem, LluisTerrados, NicolásTur, Josep A.Segú, MartaHoms, ClaraGarcía-Álvarez, AliciaBenavente-Marín, Juan C.Barón-López, F. JavierLabayen Goñi, IdoiaZapico, Augusto G.Sánchez-Gómez, JesúsJiménez-Zazo, FabioMarín-Cascales, ElenaSevilla-Sánchez, MartaHerrera-Ramos, EstefaníaPulgar, SusanaBibiloni, María del MarSistac-Sorigué, ClaraGómez, Santiago F.2022-01-172022-01-1720211479-586810.1186/s12966-021-01169-whttps://academica-e.unavarra.es/handle/2454/41795Background: Validation of self-reported tools, such as physical activity (PA) questionnaires, is crucial. 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. The effect of linear calibration on PAU-7S validity was tested. Methods: A 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. Weight, height, and waist circumference were measured. Cronbach alpha was calculated for internal consistency. Test-retest reliability was determined by intra-class correlation (ICC). Concurrent validity was assessed by ICC and Spearman correlation coefficient between moderate to vigorous PA (MVPA) derived by the PAU-7S and by accelerometer. Concordance between both methods was analyzed by absolute agreement, weighted kappa, and Bland-Altman statistics. Multiple linear regression models were fitted for construct validity and predictive validity was determined by leave-one-out cross-validation.12 p.application/pdfeng© The Author(s) 2021. Creative Commons Attribution 4.0 International LicenseAccelerometryChildren and adolescentsSelf-reported physical activityShort PAQValidationinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccessAcceso abierto / Sarbide irekia