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dc.contributor.authorSchröder, Helmut
dc.contributor.authorSubirana Cachinero, Isaac
dc.contributor.authorWärnberg, Julia
dc.contributor.authorMedrano, María
dc.contributor.authorGonzález-Gross, Marcela
dc.contributor.authorGusi, Narcis
dc.contributor.authorAznar, Susana
dc.contributor.authorAlcaraz, Pedro E.
dc.contributor.authorGonzález-Valeiro, Miguel A.
dc.contributor.authorSerra-Majem, Lluis
dc.contributor.authorTerrados, Nicolás
dc.contributor.authorTur, Josep A.
dc.contributor.authorSegú, Marta
dc.contributor.authorHoms, Clara
dc.contributor.authorGarcia-Álvarez, Alicia
dc.contributor.authorBenavente-Marín, Juan C.
dc.contributor.authorBarón-López, F. Javier
dc.contributor.authorLabayen, Idoia
dc.contributor.authorZapico, Augusto G.
dc.contributor.authorSánchez-Gómez, Jesús
dc.contributor.authorJiménez-Zazo, Fabio
dc.contributor.authorMarín-Cascales, Elena
dc.contributor.authorSevilla-Sanchez, Marta
dc.contributor.authorHerrera-Ramos, Estefanía
dc.contributor.authorPulgar, Susana
dc.contributor.authorBibiloni, María del Mar
dc.contributor.authorSistac-Sorigué, Clara
dc.contributor.authorGómez Santos, Santiago Felipe
dc.description.abstractBackground 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. Results The PAU-7S overestimated MVPA by 18%, compared to accelerometers (106.5 ± 77.0 vs 95.2 ± 33.2 min/day, respectively). A Cronbach alpha of 0.76 showed an acceptable internal consistency of the PAU-7S. Test-retest reliability was good (ICC 0.71 p < 0.001). Spearman correlation and ICC coefficients of MVPA derived by the PAU-7S and accelerometers increased from 0.31 to 0.62 and 0.20 to 0.62, respectively, after calibration of the PAU-7S. Between-methods concordance improved from a weighted kappa of 0.24 to 0.50 after calibration. A slight reduction in ICC, from 0.62 to 0.60, yielded good predictive validity. Multiple linear regression models showed an inverse association of MVPA with standardized body mass index (β − 0.162; p < 0.077) and waist to height ratio (β − 0.010; p < 0.014). All validity dimensions were somewhat stronger in boys compared to girls. Conclusion The PAU-7S shows a good test-retest reliability and acceptable internal consistency. All dimensions of validity increased from poor/fair to moderate/good after calibration. The PAU-7S is a valid instrument for measuring MVPA in children and adolescents.ca_ES
dc.relation.isformatofReproducció del document publicat a
dc.relation.ispartofInternational Journal of Behavioral Nutrition and Physical Activity, 2021, vol. 18, article 98ca_ES
dc.rightscc-by (c) Schröder et al., 2021ca_ES
dc.subjectChildren and adolescentsca_ES
dc.subjectSelf-reported physical activityca_ES
dc.subjectShort PAQca_ES
dc.titleValidity, reliability, and calibration of the physical activity unit 7 item screener (PAU7S) at population scaleca_ES

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