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Development of the Insomnia Screening Scale based on ICSD-II
Zai-Ting Yeh1, Rayleigh Ping-Ying Chiang, Shih-Chung Kang
1Department of Clinical Psychology, Fu Jen Catholic University, Taipei, Taiwan. yehzaiting@ntu.edu.tw
International Journal of Psychiatry in Clinical Practice
|July 17, 2012
Summary
A new Insomnia Screening Scale (ISS) based on ICSD-II criteria was developed. This reliable and valid tool assesses insomnia symptoms, sleep environment, and opportunities, improving upon previous instruments.
Area of Science:
- Sleep Medicine
- Psychometrics
Background:
- Existing instruments for insomnia assessment lack alignment with the International Classification of Sleep Disorder, 2nd edition (ICSD-II) criteria.
- There is a need for a validated scale that incorporates the latest diagnostic guidelines for insomnia.
Purpose of the Study:
- To develop and validate the Insomnia Screening Scale (ISS), a novel instrument based on ICSD-II diagnostic criteria.
- To evaluate the reliability and validity of the ISS in individuals with insomnia and in a general population survey.
Main Methods:
- Study 1: Item formulation, reliability, and validity assessment of the ISS in clinical insomniac subjects.
- Study 2: External validity testing of the ISS in a community survey, examining its relationship with daytime function, particularly working memory.
Main Results:
- The final ISS demonstrated strong internal consistency (α = 0.87-0.98) and explained 64% of the variance.
- Individuals with insomnia exhibited poorer working memory performance compared to controls.
Conclusions:
- The ICSD-II-based Insomnia Screening Scale (ISS) is a reliable and valid measure for assessing insomniac symptoms.
- The ISS uniquely evaluates subjective symptoms, sleep environment, and sleep opportunities, differentiating it from prior assessment tools.
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