Sadeghniiat-Haghighi Khosro, Montazeri Ali, Khajeh-Mehrizi Ahmad, Nedjat Saharnaz, Aminian Omid
Occupational Sleep Research Center, Tehran University of Medical Sciences, Tehran, Iran.
Qual Life Res. 2014 Mar;23(2):533-7. doi: 10.1007/s11136-013-0489-3. Epub 2013 Aug 3.
The main purpose of this study was to describe the cultural adaptation of a Persian version of the Insomnia Severity Index and to evaluate its psychometric properties by testing internal consistency, construct validity, discriminant validity, and concurrent validity.
Cross-cultural adaptation was carried out according to guidelines and included forward and backward translations, expert committee, and field test. A sample of 1,037 sleep clinic patients filled in a questionnaire package including the Persian version of the Insomnia Severity Index (ISI-P), the Pittsburgh Sleep Quality Index (PSQI), the Epworth Sleepiness Scale (ESS), and the Beck Depression Inventory (BDI). In addition, 624 of these patients were assessed by polysomnography (PSG). A group of 50 members of hospital staff responded to the ISI-P as the control group. Internal consistency with Cronbach's alpha, construct validity with principal component analysis, discriminant validity with assessing the ISI-P's ability to differentiate patients from control group and concurrent validity with exploring the spearman correlation with the PSQI, ESS, BDI, and corresponding parameters in PSG were followed to examine the psychometric properties of the ISI-P.
The ISI-P showed acceptable internal consistency (Cronbach's alpha = 0.78) and a 2-factor solution in factor analysis. The ISI-P discriminated well between patients and control group (15.90 ± 6.12 vs 10.10 ± 5.76, P value <0.001). Items and total score of the ISI-P showed a weak correlation with the corresponding parameters in PSG. The ISI-P total score was significantly correlated with total score of the PSQI (r = 0.74, P value <0.001) and the BDI (r = 0.42, P value <0.001), while it was not significantly correlated with total score of the ESS (r = 0.12, P value = 0.72).
Cross-cultural adaptation was successful, and the ISI-P has good psychometric properties. Using the ISI-P is recommended to evaluate insomnia in research and clinical settings in Persian-speaking people.
本研究的主要目的是描述失眠严重程度指数波斯文版的文化适应性，并通过测试内部一致性、结构效度、区分效度和同时效度来评估其心理测量特性。
根据指南进行跨文化适应，包括正向和反向翻译、专家委员会和现场测试。1037名睡眠诊所患者的样本填写了一份问卷包，其中包括失眠严重程度指数波斯文版（ISI-P）、匹兹堡睡眠质量指数（PSQI）、爱泼华嗜睡量表（ESS）和贝克抑郁量表（BDI）。此外，其中624名患者接受了多导睡眠图（PSG）评估。一组50名医院工作人员作为对照组对ISI-P进行了回应。采用Cronbach's alpha系数评估内部一致性，主成分分析评估结构效度，通过评估ISI-P区分患者与对照组的能力来评估区分效度，通过探索与PSQI、ESS、BDI以及PSG中相应参数的斯皮尔曼相关性来评估同时效度，以检验ISI-P的心理测量特性。
ISI-P显示出可接受的内部一致性（Cronbach's alpha = 0.78），并且在因子分析中呈现出两因素解决方案。ISI-P能够很好地区分患者和对照组（15.90±6.12对10.10±5.76，P值<0.001）。ISI-P的项目和总分与PSG中的相应参数显示出弱相关性。ISI-P总分与PSQI总分（r = 0.74，P值<0.001）和BDI总分（r = 0.42，P值<0.001）显著相关，而与ESS总分（r = 0.12，P值 = 0.72）无显著相关性。
跨文化适应是成功的，ISI-P具有良好的心理测量特性。建议在波斯语人群的研究和临床环境中使用ISI-P来评估失眠。
