SRQ-D II 31とSRQ-D II 15の信頼性・妥当性の検討 : 第1報  [in Japanese] Development and Validation of Self Rating Questionnaire-Depression II 31 and SRQ-D II 15 : First Report  [in Japanese]

目的: SRQ-D (self rating questionnaire of depression)は,仮面うつ病のスクリーニング検査として医療機関で活用されているが,情報量が乏しく簡便性に欠ける点が問題点として挙げられる.そこで,抑うつ状態の評価を目的としてSRQ-Dを改良してSRQ-D II 31を作成し,信頼性・妥当性を検討した,さらに,大うつ病性障害のスクリーニング検査としてSRQ-D II 15を作成し,検討を重ねたので報告する.方法: 正常対照群129名,患者群34名にSDS・SRQ-D II 31とM.I.N.Iによる診断面接を行った.また,正常対照群には再テストを行った.結果: まず,SRQ-D II 31を因子分析して,1因子31項目を抽出した.この質問紙の内的整合性は高かった.SRQ-D II 31の中で因子負荷量の高かった15項目を抽出し,SRQ-D II 15を作成しスクリーニング検査として有用かどうか検討した.1因子15項目が因子分析により抽出され,高い内的整合性を示した.また,再テスト信頼性も両テストとも十分高かった.妥当性に関しても,両テストともSDSとの相関は強かった.カットオフポイントは34/35としたところ感度0,857,特異度0.853だった.結論 : 本研究において,SRQ-D II 31は抑うつ評価尺度として信頼性・妥当性をもち,SRQ-D II 15は大うつ病性障害のスクリーニング検査として有効だったが,今後も検討を続けていきたい.

A purpose of this study is to develop and validate two questionnaires ; Self rating questionnaire for depression (SRQ-D) II 31 and SRQ-D II 15 revised SRQ-D. The SRQ-D II 31 was made for the assessment of depressive state, and the SRQ-D15 was made for screening of major depression. 34 outpatients with major depression and 129 students completed the SRQ-D II 31 and the SDS. Exploratory factor analysis revealed that the SRQ-D II 31 included 31-items loading on one factor, which was named "symptoms of depressive state". Internal consistency of these scale were sufficiently high (SRQ-D31 : α = 0.93). 15 items out of those which had highly factor loading in SRQ-D II 31 were extracted and we made SRQ-D II 15. We examined whether or not SRQ-D II 15 can be used for a screening test. Exploratory factor analysis revealed that the SRQ-D II 15 included 15-items loading on one factor, which was named "symptoms of depressive state". Internal consistency of this scale was sufficiently high (α =0.94). A correlation coefficient between SRQ-D II 15 and SDS was strong. SRQ-D II 15's cutoff point was set at 34/35. (sensitivity : 0.857, speficitivity : 0.853) SRQ-D II 31 and SRQ-D II 15 are questionnaires which have both reliability and propriety together. We can use SRQ-D II 15 as a screening test for depressive episodes. We will make a further report after conducting more investigation.