日本版「小児版・作業に関する自己評価」の構成概念妥当性と信頼性の検討

Reliability and construct validity of the Japanese version of Child Occupational Self Assessment

要旨：日本版「小児版・作業に関する自己評価（以下，COSA）」の信頼性と妥当性の検討を目的に，通常学級に通う児童356名に日本版COSAを実施した．Cronbachのα係数による内部一貫性と再試験法により信頼性を検討し，探索的因子分析により構成概念妥当性を検討した．その結果，高い内部一貫性と十分な再検査信頼性が確認された．また，日本版COSAの有能性尺度得点を用いた探索的因子分析から「挑戦的作業」，「動機づけられた作業」，「日常生活課題」，「期待された課題」の4因子構造を持つことがわかり，これらの因子構造は作業の分類と関連すると考えられた．日本版COSAは高い信頼性と構成概念妥当性を持つと考えられた．

　In order to examine the reliability and validity of the Japanese version of the Child Occupational Self Assessment (COS A), we implemented the Japanese version of COS A for 356 children in a regular school class. We examined the internal consistency based on Cronbach's a coefficient and the test-retest reliability. Furthermore, based on an exploratory factor analysis, we examined the construct validity. Based on the exploratory factor analysis using occupational competence scores, it was found that the Japanese version of COS A had four factor structures: "challenging occupations", "motivated occupations", "daily life tasks", and "expected tasks". It is believed that these factor structures included in the Japanese version of COSA are related to the classifications of occupations. In addition, the Japanese version of COSA was confirmed to have a high level of internal consistency and sufficient test-retest retesting reliability. It is therefore believed that the Japanese version of COSA has high reliability and construct validity.