%0 Journal Article
%A Schröder, Helmut
%A Subirana, Isaac
%A Wärnberg, Julia
%A Medrano, María
%A González-Gross, Marcela
%A Gusi, Narcis
%A Aznar, Susana
%A Alcaraz, Pedro E
%A González-Valeiro, Miguel A
%A Serra-Majem, Lluis
%A Terrados, Nicolás
%A Tur, Josep A
%A Segú, Marta
%A Homs, Clara
%A Garcia-Álvarez, Alicia
%A Benavente-Marín, Juan C
%A Barón-López, F Javier
%A Labayen, Idoia
%A Zapico, Augusto G
%A Sánchez-Gómez, Jesús
%A Jiménez-Zazo, Fabio
%A Marín-Cascales, Elena
%A Sevilla-Sanchez, Marta
%A Herrera-Ramos, Estefanía
%A Pulgar, Susana
%A Del Mar Bibiloni, María
%A Sistac-Sorigué, Clara
%A Gómez, Santiago F
%T Validity, reliability, and calibration of the physical activity unit 7 item screener (PAU-7S) at population scale.
%D 2021
%U http://hdl.handle.net/10668/18211
%X 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. 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. 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  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. Trial registration number ISRCTN34251612 .
%K Accelerometry
%K Children and adolescents
%K Self-reported physical activity
%K Short PAQ
%K Validation
%~