HIGHLIGHTS
- What: This study aimed to assess the psychometric properties of the Irrational Beliefs Scale for Insomnia (IBSI) in Turkish emerging adults. The aim of the study is to establish the validity and reliability of the IBSI, thereby contributing a novel and comprehensive instrument for assessing insomnia within the framework of REBT. The data of the study were collected at the stages of focus group interview, pilot study, exploratory factor analysis and confirmatory factor analysis, respectively. To provide evidence of validity based on internal structure through EFA and CFA, the authors focused on Kaiser-Meyer-Olkin test (KMO . . .

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