標準失語症検査における基準関連妥当性の検討

Examination of Criterion Validity about the Standard Language Test of Aphasia

標準失語症検査（SLTA）の基準関連妥当性を検証した。失語症発症後，3カ月以上経過した患者にSLTAとWAB失語症検査日本語版（WAB-J）を実施し，SLTAとWAB-Jのスピアマン順位相関係数を算出した。対象者は20名で男性14名，女性6名，平均年齢は68.5歳，原因疾患は脳梗塞14名，脳出血6名であった。SLTAとWAB-Jの相関係数は，SLTA総合評価尺度とWAB-J失語指数ではr＝0.870（P＜0.001），SLTA（A）書字因子とWAB-J（VI）書字ではr＝0.852（P＜0.001），SLTA書字命令に従うとWAB-J文字による命令文ではr＝0.807（P＜0.001）であり，下位項目Z得点同士はr≧0.7が多数であった。以上より，SLTAは基準関連妥当性を有すると言える。

Abstract

The Standard Language Test of Aphasia (SLTA) is the most frequently used comprehensive aphasia rating scale in Japan. Although the SLTA has been verified for reliability, verification for validity is inadequate. The purpose of this study was to examine criterion-related validity of the SLTA. The SLTA was performed on patients who had passed 3months or more after onset of the aphasia-causing disease such as stroke, and the Japanese version of the Western Aphasia Battery (WAB) was subsequently performed. We investigated age, gender, disease, and calculated Spearman's rank correlation coefficient for total score and each item of the SLTA and the WAB. There were 20participants (14males, 6females), with a mean age of 68.5±12.5years. Correlations of the SLTA and the WAB were as follows: SLTA total index score and WAB aphasia quotient; r＝0.870 (P＜0.001), SLTA Writing factor and WAB (VI) Writing; r＝0.852 (P＜0.001), SLTA writing instructions and WAB writing instructions; r＝0.807 (P＜0.001). Many of the correlations of Z-scores between sub-tests were r≥0.7. The SLTA has criteria-related validity and now the aphasia test that has been tested for reliability and validity.

(Received July 22, 2019; Accepted March 4, 2020; Published July 1, 2020)