認知機能変動評価尺度（Cognitive Fluctuation Inventory：CFI）の内容妥当性と評価者間信頼性の検討

Content Validity and Inter-rater Reliability of the Cognitive Fluctuation Inventory

認知機能変動評価尺度（Cognitive Fluctuation Inventory：CFI）の内容妥当性と評価者間信頼性を検討した。内容妥当性は9名の専門家に調査を行い，質問の適切性や網羅性に問題ないことを確認した。また，29名のレビー小体型認知症患者を対象に別々の調査者がCFIを2回実施し，結果の一致度から評価者間信頼性を検討した。一致度の指標とした級内相関係数は0.746と良好であった。CFIは認知機能変動を評価するための指標として，十分な特性を有することが確認された。

Abstract

Objective: The Cognitive Fluctuation Inventory (CFI) was developed to evaluate cognitive fluctuation in patients with dementia with Lewy bodies (DLB).　The objective of this study was to assess the content validity and inter-rater reliability of the CFI.

Subjects and Methods: Nine specialists in DLB treatment were invited to participate in the survey to assess the content validity of the CFI.　They were asked to assess the relevance and comprehensibility of the question items.　In the validation study, inter-rater reliability was assessed using the intraclass correlation coefficient (ICC).

Results: Regarding content validity, all nine specialists considered the main question and sub-questions to be relevant to cognitive fluctuation in patients with DLB.　Eight out of nine specialists considered the CFI to be a comprehensive measure for detecting cognitive fluctuation in patients with DLB.　In the analysis, which used data from 29 patients and their caregivers, the ICC of the CFI was 0.746, which suggests good inter-rater reliability.

Conclusion: We found that the CFI showed good content validity and inter-rater reliability for evaluating cognitive fluctuation in patients with DLB.

(Received April 5, 2013; Accepted September 20, 2013; Published February 1, 2014)