Psychometric Properties and Item Evaluation of Korean Version of Night Eating Questionnaire (KNEQ)

PURPOSE: The aim of this study was to develop a Korean version of Night Eating Questionnaire (KNEQ) and test its psychometric properties and evaluate items according to item response theory. METHODS: The 14-item NEQ as a measure of severity of the night eating syndrome was translated into Korean, and then this KNEQ was evaluated. A total of 1171 participants aged 20 to 50 completed the KNEQ on the Internet. To test reliability and validity, Cronbach's alpha, correlation, simple regression, and factor analysis were used. Each item was analyzed according to Rasch-Andrich rating scale model and item difficulty, discrimination, infit/outfit, and point measure correlation were evaluated. RESULTS: Construct validity was evident. Cronbach's alpha was .78. The items of evening hyperphagia and nocturnal ingestion showed high ability in discriminating people with night eating syndrome, while items of morning anorexia and mood/sleep provided relatively little information. The results of item analysis showed that item2 and item7 needed to be revised to improve the reliability of KNEQ. CONCLUSION: KNEQ is an appropriate instrument to measure severity of night eating syndrome with good validity and reliability. However, further studies are needed to find cut-off scores to screen persons with night eating syndrome.

Psychometric Properties of Korean Version of Modified Leeds Sleep Evaluation Questionnaire (KMLSEQ) / 재활간호학회지

PURPOSE: The Leeds Sleep Evaluation Questionnaire (LSEQ) translated into Korean was modified to easily apply and reduce respondents' confusion and was evaluated for psychometric properties and discriminant ability. METHODS: A total of 960 Korean adults aged 45 years and older participated in this cross-sectional survey. To test reliability, validity and discriminant ability, Cronbach's alpha, correlation analysis, confirmatory factor analysis, simple regression analysis and receiver operating characteristics (ROC) curve analysis were used. RESULTS: Item-total correlations ranged between .62~.85 and Cronbach's alpha was .95. Area under ROC was .86 (95% CI: .83~.90) and the optimal cutoff score was identified as < or = 66 (sensitivity, .77; specificity, .84; positive/negative predictive values, .49/.95). Using this cutoff score, the prevalence of insomnia in the study sample was 25.8% and tended to be more common in female and older groups. CONCLUSION: The data supported the psychometric properties of Korean Modified Leeds Sleep Evaluation Questionnaire (KMLSEQ) as an acceptable sleep measurement. In addition, KMLSEQ is likely to be a useful screening tool for insomnia.

Psychometric Properties of Korean Minimal Insomnia Screening Scale

PURPOSE: The purposes of this study were to develop a Minimal Insomnia Screening Scale for Korean adults (KMISS) and to evaluate psychometric properties and discriminant ability of the developed scale. METHODS: Data from a cross-sectional survey of 959 Korean adults were analyzed to develop the summated insomnia scale, which was evaluated in terms of reliability, validity, and discriminant ability by receiver operating characteristics (ROC) curve analysis. RESULTS: Item-total correlations ranged between .71-.79 and Cronbach's alpha was .87. Adequate validity was also evident. ROC-curve analysis showed area under ROC was .87 (95% CI: .84-.90) and identified the optimal cut-off score as < or = 20 (sensitivity, .83; specificity, .75; positive/negative predictive values, .40/.95). Using this cut-off score, the prevalence of insomnia in the study sample was 26.3% and most frequent among women and the oldest group. CONCLUSION: Data supports the psychometric properties of KMISS as a possible insomnia screening instrument. KMISS also shows promise as a convenient ultra-short screening measure of insomnia for adults and epidemiological studies in community health care settings.

Korean Versions of Self-reported Sleep Questionnaires for Research and Practice on Sleep Disturbance / 재활간호학회지

PURPOSE: To identify Korean versions of self-reported sleep questionnaires for cross-cultural research and practice on sleep disturbance, we searched self-reported sleep questionnaires which have been developed to measure general sleep patterns. They should be qualitative, easy to take permission, do not obligate to pay, do not need any skill or professional help for scoring and have been reported high reliability and validity. METHODS: General Sleep Disturbance Scale (GSDS), Leeds Sleep Evaluation Questionnaire (LSEQ), and Pittsburgh Sleep Quality Index (PSQI) were identified based on all criteria. Korean version of GSDS, LSEQ, and PSQI were developed according to the methods combined the guidelines for the process of cross-cultural adaptation of self-reported measures with decentering method. RESULTS: Three Korean versions of self-reported sleep questionnaires were suitable for epidemiological study. They are not full length and easy to read. It requires less than 10 minutes for each subject to complete as well as for researchers to score. CONCLUSION: Psychometric analysis study is necessary to evaluate the reliability and validity of those Korean versions of self-reported sleep questionnaires.