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oai:repisalud.isciii.es:20.500.12105/231552025-04-29T10:57:02Zcom_20.500.12105_15322com_20.500.12105_2051col_20.500.12105_16967

00925njm 22002777a 4500 dc Schroder, Helmut author Subirana, Isaac author Warnberg, Julia author Medrano, María author Gonzalez-Gross, Marcela author Gusi, Narcis author Aznar, Susana author Alcaraz, Pedro E author Gonzalez-Valeiro, Miguel A author Serra-Majem, Lluis author Terrados, Nicolas author Tur, Josep A author Segu, Marta author Homs, Clara author Garcia-Alvarez, Alicia author Benavente-Marin, Juan C author Baron-Lopez, F. Javier author Labayen, Idoia author Garcia Zapico, Augusto author Sanchez-Gomez, Jesus author Jimenez-Zazo, Fabio author Marin-Cascales, Elena author Sevilla-Sanchez, Marta author Herrera-Ramos, Estefania author Pulgar, Susana author Bibiloni Esteva, Maria Del Mar author Sistac-Sorigue, Clara author Gomez, Santiago F author 2021-07-17 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 (beta - 0.162; p < 0.077) and waist to height ratio (beta - 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. Schroder H, Subirana I, Warnberg J, Medrano M, Gonzalez-Gross M, Gusi N, et al. Validity, reliability, and calibration of the physical activity unit 7 item screener (PAU-7S) at population scale. Int J Behav Nutr Phys Act. 2021 Jul 17;18(1):98. https://hdl.handle.net/20.500.13003/19904 https://hdl.handle.net/20.500.12105/23155 34274002 10.1186/s12966-021-01169-w 1479-5868 International Journal of Behavioral Nutrition and Physical Activity 2-s2.0-85110309274 675608000001 L2013156350 Children and adolescents Self-reported physical activity Short PAQ Validation Accelerometry Validity, reliability, and calibration of the physical activity unit 7 item screener (PAU-7S) at population scale