Zanjani Zahra, Yaghubi Hamid, Shaeiri Mohammadreza, Gholami Fesharaki Mohammad
Department of Psychology, School of Medicine, Kashan University of Medicine Sciences, Kashan, Iran.
Department of Psychology, School of Humanities, Shahed University, Tehran, Iran.
Iran J Psychiatry. 2018 Jul;13(3):168-174.
In recent years, many researchers have been searching for effective cognitive factors in the development of obsessive-compulsive disorder (OCD). One of the scales designed to measure this characteristic is the contamination cognition scale (CCS) that evaluates 2 dimensions: overestimating the likelihood and severity of contamination. The aim of the present study was to evaluate the psychometric properties of the Persian version of CCS. The study population of this descriptive psychometric study included students of Shahed University. A total of 490 students were selected via cluster sampling and completed the CCS. CCS was translated and back- translated before given to the students. The Obsessive Beliefs Questionnaire (OBQ) and the Padua Inventory (PI) were used. To assess the evidence for the validity of the scale, the exploratory and confirmatory factor analyses were used. The gathered data were analyzed by SPSS-22 and Amos-22 software. The results of the confirmatory factor analysis (CFA) showed that one-factor model did not have adequate fitness (RMSEA>.05). Therefore, to explore the factors of this scale, exploratory factor analysis (EFA) was used, and it revealed 3 factors (public equipment, food, and restroom) for each of the dimensions (likelihood and severity). CFA by AMOS-22 confirmed the three-factor model (GFI, CFI, and NFI>.95; RMSEA<.05). Furthermore, the results supported criteria validity of CCS with the PI total score (0.56- 0.47, p<0.001) and PI-contamination subscale (0.71-0.75, p<0.001). Also, the correlation between CCS and responsibility/threat subscale of the OBQ was significant (0.47- 0.49, p<0.001) The Cronbach's alpha for likelihood dimensions total was 0.93 and it was 0.94 for severity dimension total. The composite reliability was 0.95 for the likelihood dimension and 0.96 for severity dimension of CCS. Also, the test-retest reliability after a 4-week interval was confirmed (likelihood: r = 0.78; severity: r = 0.81, p<.001). The results indicated that one-factor model of CCS did not have adequate fitness, but three-factor model was confirmed in both dimensions (likelihood and severity). According to the results of the present study, the reliability and validity of the Persian version of CCS were acceptable.
近年来，许多研究人员一直在寻找强迫症（OCD）发展过程中的有效认知因素。旨在测量这一特征的量表之一是污染认知量表（CCS），该量表评估两个维度：高估污染的可能性和严重程度。本研究的目的是评估CCS波斯语版本的心理测量特性。
这项描述性心理测量研究的研究对象包括沙希德大学的学生。通过整群抽样共选取了490名学生，并让他们完成了CCS。在将CCS发放给学生之前，先进行了翻译和回译。使用了强迫信念问卷（OBQ）和帕多瓦量表（PI）。为了评估该量表有效性的证据，采用了探索性和验证性因素分析。收集到的数据通过SPSS - 22和Amos - 22软件进行分析。
验证性因素分析（CFA）的结果表明，单因素模型的拟合度不佳（RMSEA>.05）。因此，为了探索该量表的因素，使用了探索性因素分析（EFA），结果显示在每个维度（可能性和严重程度）上都有3个因素（公共设施、食物和洗手间）。AMOS - 22进行的CFA证实了三因素模型（GFI、CFI和NFI>.95；RMSEA<.05）。此外，结果支持了CCS与PI总分（0.56 - 0.47，p<0.001）以及PI污染分量表（0.71 - 0.75，p<0.001）之间的标准效度。而且，CCS与OBQ的责任/威胁分量表之间的相关性显著（0.47 - 0.49，p<0.001）。可能性维度总分的Cronbach's alpha为0.93，严重程度维度总分为0.94。CCS可能性维度的组合信度为0.95，严重程度维度为0.96。此外，4周间隔后的重测信度也得到了证实（可能性：r = 0.78；严重程度：r = 0.81，p<.001）。
结果表明，CCS的单因素模型拟合度不佳，但在两个维度（可能性和严重程度）上三因素模型都得到了证实。根据本研究结果，CCS波斯语版本的信度和效度是可以接受的。
