Validity, reliability, and calibration of the physical activity unit 7 item screener (PAU-7S) at population scale

Background: 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...

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Detalles Bibliográficos
Autores: Schröder, Helmut, Subirana, Isaac, Wärnberg, Julia, Medrano, María, González Gross, Marcela, Gusi, Narcis, Aznar, Susana, Alcaraz, Pedro E., González Valeiro, Miguel A., Serra-Majem, Lluis, Terrados, Nicolás, Tur, Josep A., Segú, Marta, Homs, Clara, Alvarez-Garcia, Alicia, Benavente Marín, Juan C., Barón López, F. Javier, Labayen, Idoia, Zapico, Augusto G., Sánchez Gómez, Jesús, Jiménez Zazo, Fabio, Marín Cascales, Elena, Sevilla Sanchez, Marta, Herrera Ramos, Estefanía, Pulgar, Susana, Bibiloni, María del Mar, Sistac Sorigué, Clara, Gómez, Santiago F.
Tipo de recurso: artículo
Fecha de publicación:2021
País:España
Institución:Universitat Oberta de Catalunya (UOC)
Repositorio:O2, repositorio institucional de la UOC
OAI Identifier:oai:openaccess.uoc.edu:10609/137087
Acceso en línea:https://hdl.handle.net/10609/137087
https://doi.org/10.1186/s12966-021-01169-w
Access Level:acceso abierto
Palabra clave:children and adolescents
self-reported physical activity
short PAQ
validation
accelerometry
Descripción
Sumario:Background: 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 (B - 0.162; p < 0.077) and waist to height ratio (B - 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.

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