Dataset Information

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

ABSTRACT:

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 (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.

Trial registration

Trial registration number ISRCTN34251612 .

SUBMITTER: Schroder H

PROVIDER: S-EPMC8285783 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature

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Publications

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

Schröder Helmut H Subirana Isaac I Wärnberg Julia J Medrano María M González-Gross Marcela M Gusi Narcis N Aznar Susana S Alcaraz Pedro E PE González-Valeiro Miguel A MA Serra-Majem Lluis L Terrados Nicolás N Tur Josep A JA Segú Marta M Homs Clara C Garcia-Álvarez Alicia A Benavente-Marín Juan C JC Barón-López F Javier FJ Labayen Idoia I Zapico Augusto G AG Sánchez-Gómez Jesús J Jiménez-Zazo Fabio F Marín-Cascales Elena E Sevilla-Sanchez Marta M Herrera-Ramos Estefanía E Pulgar Susana S Del Mar Bibiloni María M Sistac-Sorigué Clara C Gómez Santiago F SF

The international journal of behavioral nutrition and physical activity 20210717 1

<h4>Background</h4>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.<h4>Methods</h4>A randomized sample of 321 healthy ch ...[more]

PMID: 34274002

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Dataset Information

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

Background

Methods

Results

Conclusion

Trial registration

Publications

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

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