J. Med. Internet Res. - Web-based assessments of physical activity in youth: considerations for design and scale calibration.

Tópicos

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Resumo

This paper describes the design and methods involved in calibrating a Web-based self-report instrument to estimate physical activity behavior. The limitations of self-report measures are well known, but calibration methods enable the reported information to be equated to estimates obtained from objective data. This paper summarizes design considerations for effective development and calibration of physical activity self-report measures. Each of the design considerations is put into context and followed by a practical application based on our ongoing calibration research with a promising online self-report tool called the Youth Activity Profile (YAP). We first describe the overall concept of calibration and how this influences the selection of appropriate self-report tools for this population. We point out the advantages and disadvantages of different monitoring devices since the choice of the criterion measure and the strategies used to minimize error in the measure can dramatically improve the quality of the data. We summarize strategies to ensure quality control in data collection and discuss analytical considerations involved in group- vs individual-level inference. For cross-validation procedures, we describe the advantages of equivalence testing procedures that directly test and quantify agreement. Lastly, we introduce the unique challenges encountered when transitioning from paper to a Web-based tool. The Web offers considerable potential for broad adoption but an iterative calibration approach focused on continued refinement is needed to ensure that estimates are generalizable across individuals, regions, seasons and countries.

Resumo Limpo

paper describ design method involv calibr webbas selfreport instrument estim physic activ behavior limit selfreport measur well known calibr method enabl report inform equat estim obtain object data paper summar design consider effect develop calibr physic activ selfreport measur design consider put context follow practic applic base ongo calibr research promis onlin selfreport tool call youth activ profil yap first describ overal concept calibr influenc select appropri selfreport tool popul point advantag disadvantag differ monitor devic sinc choic criterion measur strategi use minim error measur can dramat improv qualiti data summar strategi ensur qualiti control data collect discuss analyt consider involv group vs individuallevel infer crossvalid procedur describ advantag equival test procedur direct test quantifi agreement last introduc uniqu challeng encount transit paper webbas tool web offer consider potenti broad adopt iter calibr approach focus continu refin need ensur estim generaliz across individu region season countri

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