Development of the sleep quality scale
- Authors
- Yi, Hyeryeon; Shin, Kyungrim; Shin, Chol
- Issue Date
- 9월-2006
- Publisher
- BLACKWELL PUBLISHING
- Keywords
- reliability; Sleep Quality Scale; validity
- Citation
- JOURNAL OF SLEEP RESEARCH, v.15, no.3, pp.309 - 316
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF SLEEP RESEARCH
- Volume
- 15
- Number
- 3
- Start Page
- 309
- End Page
- 316
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/123115
- DOI
- 10.1111/j.1365-2869.2006.00544.x
- ISSN
- 0962-1105
- Abstract
- Sleep quality affects health and the overall quality of life. As the factors that influence sleep quality and their relative importance vary among individuals, a self-report method is essential. Although various questionnaires have been used to assess sleep quality, few all-inclusive assessment scales have been developed. Therefore, the purpose of this study was to develop an instrument for measuring sleep quality and to study its validity and reliability. A Sleep Quality Scale (SQS) was developed using item analysis and factor analysis on items with content validity. SQS, composed of 28 items and six factors, accounted for 62.6% of the total variance. The difference of SQS score between insomniacs and normal subjects confirmed the construct validity (t = -13.8, P = 0.000). Concurrent validity was identified by the significant correlation of SQS with the Pittsburgh Sleep Quality Index (r = 0.72, P = 0.000). The Cronbach's alpha coefficient was 0.92 for internal consistency and the correlation coefficient was 0.81 for test-retest reliability at a 2-week interval. The developed SQS was therefore confirmed to be a valid and reliable instrument for the comprehensive assessment of sleep quality.
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