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The aim of the work is to present the psychometric properties of the polish version of Trait Sport-Confidence Inventory (TSCI-PL), which measures the level of sport-confidence as a trait. Robin Vealey designed the inventory (1986). The pilot study of the polish adaptation was conducted on 100 active athletes, both professional and amateur. Participants completed Trait Sport-Confidence Inventory as well as Multidimensional Self-Esteem Inventory. The analyses have confirmed high reliability and construct validity of TSCI-PL. Correlations with MSEI scales have confirmed the criterion validity of the adapted tool. The questionnaire requires further research, as well as examining a bigger group of participants, through the Internet and in person. As a result, a useful tool, characterized by satisfactory psychometric properties will be adapted for use in Poland.
Background: The purpose of the study was to validate and adapt the Trait Sport-Confidence Inventory (TSCI-PL) for use in Poland. Robin Vealey created the original tool (TSCI), which consisted of 13 self-assessment items. The phases of the adaptation procedures are described in this paper. Material/Methods: 353 amateur and professional Polish athletes took part in the study. The participants filled in the TSCI-PL, SSCQ-PL and MSEI questionnaires as well as a short demographic survey. Results: Reliability of the TSCI-PL as well as the discriminatory power of the items turned out to be high. The internal validity of the TSCI-PL was confirmed using confirmatory factor analysis, as a single factor model of TSCI-PL was well matched to the data. The criterion validity of the TSCI-PL was confirmed, based on numerous correlations with SSCQ-PL and MSEI scales. Moreover, no significant correlation or difference regarding age and gender has been noted. Conclusions: Results confirmed satisfactory psychometric properties of the Polish adaptation of TSCI-PL. Therefore, the tool is ready for use among Polish sport psychologists.
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