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The Sleep Condition Indicator: reference values derived from a sample of 200 000 adults
Colin A Espie1,2, Pedro Farias Machado2, Jenna R Carl2
1Sleep and Circadian Neuroscience Institute, Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, UK.
Journal of Sleep Research
|December 2, 2017
Summary
The Sleep Condition Indicator (SCI) now has age- and sex-referenced values to aid insomnia screening. These benchmarks help clinicians evaluate patient scores against similar demographics and track treatment progress.
Area of Science:
- Clinical Psychology
- Sleep Medicine
- Psychometrics
Background:
- The Sleep Condition Indicator (SCI) is an established 8-item scale for screening insomnia disorder per DSM-5 criteria.
- Prior research confirmed the SCI's strong psychometric properties across various translations.
- Clinical practice requires normative data to interpret SCI scores effectively.
Purpose of the Study:
- To establish age- and sex-referenced values for the Sleep Condition Indicator (SCI).
- To provide clinicians with benchmarks for evaluating insomnia in diverse patient populations.
- To determine the Reliable Change Index (RCI) for the SCI.
Main Methods:
- A large-scale random sample of 200,000 individuals completed the SCI online.
- Descriptive and inferential statistics were used to generate reference data.
- Age and sex deciles were analyzed to establish normative values and RCI.
Main Results:
- Mean SCI score was 14.97 ± 5.93.
- Women generally scored higher (indicating worse insomnia symptoms) than men.
- Older individuals exhibited higher SCI scores compared to younger individuals.
Conclusions:
- The SCI is a valuable tool for insomnia screening and clinical assessment.
- Age- and sex-referenced data enhance the interpretation of SCI scores.
- The established Reliable Change Index aids in tracking treatment effectiveness.
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