日本語版Chronic Kidney Disease Self-Care scale（CKDSC）の作成

Development of the Japanese Version of the Chronic Kidney Disease Self-Care Scale

要旨

　目的：日本語版Chronic Kidney Disease Self-Care scale（CKDSC）を作成し，異文化間妥当性，尺度としての1次元性を検討する．

　方法：CKDSC（5因子16項目）の翻訳・逆翻訳を行い，日本語訳CKDSCを作成した．調査は保存期慢性腎臓病（CKD）患者を対象として実施した．解析には，確証的因子分析を用い，1次元性は2次因子モデルを構築し検討した．

　結果：分析対象者は229名であった．日本語訳したCKDSCは，原版と同じ5因子斜交モデルが成り立った（CFI＝.991，RMSEA＝.047）．2次因子モデルによる検討では，5因子15項目のモデルが1次元性を満たした（CFI＝.993，RMSEA＝.042）．ω係数は.848（各因子.823〜.941）であった．CKDステージ，栄養士からの療養指導の有無で「合計得点」に有意差を認めた．

　結論：日本語版CKDSCは，保存期CKD患者のセルフケア行動を評価する尺度として，使用可能であることが示された．

　Aim: To develop the Japanese version of the Chronic Kidney Disease Self-Care scale (CKDSC-J) for examining cross-cultural validity and evaluating self-care behavior as a secondary factor.

　Methods: The CKDSC was first translated into Japanese using a 5-factor structured model with 16 items and then back-translated. Next, we conducted a survey for predialysis patients with chronic kidney disease (CKD) grade G3-G5. To verify the cross-cultural validity of the CKDSC, we performed a confirmatory factor analysis (CFA). We created a 5-factor secondary model of the primary self-care behavior evaluation scale (15 items; CKDSC-J), and examined internal consistency and the difference in CKDSC-J scores for CKD grade and nutritionist education.

　Results: Participants comprised 229 predialysis patients. The CFA revealed that both the CKDSC (CFI = .991, RMSEA = .047) and the secondary model (CKDSC-J; CFI = .993, RMSEA = .042) fit the data well. Additionally, the internal consistency was high for the CKDSC-J at .848 and ranged from .823-.941 for the factors. The CKDSC-J score showed significant differences when compared with CKD grade and nutritionist education, which proved construct validity.

　Conclusion: The findings suggest that the CKDSC-J can effectively evaluate daily self-care behavior among predialysis patients.