Development and validation of a standardized assessment instrument for discus throwing performance: A reliability study among high school students
Abstract
This study focused on creating and validating a dependable tool for assessing discus throw performance in secondary school students. The sample comprised 240 students (120 males, 120 females; aged 15-17) from 12 institutions, selected via stratified random sampling for skill and demographic representation. The assessment tool was developed with expert guidance and preliminary testing, incorporating five technical components: starting position, starting swing, movement across the circle, power position, and release-recovery. Statistical methods included the Intraclass Correlation Coefficient (ICC) via a two-way mixed-effects model, Cronbach's alpha for internal consistency, test-retest reliability over two weeks, and Standard Error of Measurement (SEM) with bootstrapping to establish confidence intervals. The overall reliability of the instrument was excellent (ICC=0.89, 95% CI: 0.85-0.93). Notable internal consistency was found (Cronbach's α = 0.87), coupled with strong test-retest reliability (r=0.91, p<0.001). Component analysis indicated the highest reliability in the power position (ICC=0.92) and the lowest in the initial swing (ICC= 0.86). A positive correlation existed between experience level and reliability measures (ICCs from 0.86 to 0.92). Gender analysis revealed comparable reliability for males (ICC=0.88) and females (ICC=0.90). The reliability among diverse components and demographics supports its use in both formative and summative assessments.
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The works and papers that are published in this Journal are subject to the following terms:
1. The Publication Service of the University of Murcia (the publisher) has the Publication Rights (Copyright) to the published papers and works, and favors and permits the reusing of the same under the license indicated in point 2.
© Servicio de Publicaciones, Universidad de Murcia, 2013
2. The papers and works are to be published in the digital edition of the Journal under the license Creative Commons Reconocimiento-No Comercial-Sin Obra Derivada 3.0 España (legal text). The copying, using, spreading, transmitting and publicly displaying of the papers, works or publication are permitted as long as: i) the authors and original sources (Journal, publisher and URL of the publication) are quoted; ii) it is not used for commercial benefit; iii) the existence and specifications of this users license are mentioned.
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