褚氏注意力測驗應用於慢性精神分裂症病人的再測信度與最小可偵測之變化值

Test-retest Reliability and Minimal Detectable Change of Chu’s Attention Test in Persons with Chronic Schizophrenia

目的：注意力是每日生活當中，最基礎的認知功能。褚氏注意力測驗是目前在台灣精神 醫療臨床中，最為普遍用來評估注意力功能的工具之一。此工具應用於精神分裂症病人的 再測信度與最小可偵測之變化值仍未建立，因此限制了此工具測量結果的解釋性與應用性。 本研究的目的是驗證褚氏注意力測驗的再測信度與最小可偵測之變化值。 方法：本研究共徵 召 147 位精神分裂症病人。參與者完成褚氏注意力測驗的施測，前後二次，間隔一週。透過 組內相關係數驗證褚氏注意力測驗之再測信度，同時最小可偵測之變化值。此外，亦計算出 最小可偵測之變化值百分比。 結果：褚氏注意力的再測信度顯著的良好，平均區別是 1.92， ICC 是 0.95 (p < 0.001)。最小可偵測之變化值是 12.5（百分比是 22.8）。 結論：本研究結果 確認褚氏注意力測驗應用於精神分裂症病人，具有良好的測量注意力功能可靠性。此結果有 助於臨床工作者與研究者判斷，施測精神分裂症病人間隔一週，所得之注意力改變結果，是 否超過測量誤差而為真實之改變。

Objective: Attention is the most fundamental cognitive function in daily life. Chu’s Attention Test (CAT) is one of the most widely used measures for assessing attention function in clinical psychiatric settings in Taiwan. The test-retest reliabil-ity and the minimal detectable change (MDC) of this measure remain largely un-known for patients with schizophrenia, limiting the interpretability and applicabil-ity of this measure. The purpose of this study was to investigate the test-retest reliability and the MDC of the CAT in patients with schizophrenia. Methods: One hundred and forty-seven patients with schizophrenia were recruited in this study. The participants completed the CAT at two sessions spaced one week apart. The intra-class correlation coefficient (ICC) was used to examine the test-retest reli-ability, and the MDC was calculated from the standard error of measurement. In addition, the percentage MDC (MDC%) was calculated. Results: The test-retest reliability of the CAT was excellent (p < 0.001) with difference of mean 1.9; and ICC was 0.95. The MDC (MDC%) was 12.5 (22.8%). Conclusion: Based on the results of this study, we suggest that the CAT is reliable in monitoring the attention function in patients with schizophrenia. These findings could help clinicians and researchers judge whether a change in the CAT between two repeated sessions is real for patients with schizophrenia.