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BMJ Open. 2014 Mar 18;4(3):e004183. doi: 10.1136/bmjopen-2013-004183.

The Sleep Condition Indicator: a clinical screening tool to evaluate insomnia disorder.

Author information

1
Nuffield Department of Clinical Neurosciences/Sleep & Circadian Neuroscience Institute, University of Oxford, UK.

Abstract

OBJECTIVE:

Describe the development and psychometric validation of a brief scale (the Sleep Condition Indicator (SCI)) to evaluate insomnia disorder in everyday clinical practice.

DESIGN:

The SCI was evaluated across five study samples. Content validity, internal consistency and concurrent validity were investigated.

PARTICIPANTS:

30 941 individuals (71% female) completed the SCI along with other descriptive demographic and clinical information.

SETTING:

Data acquired on dedicated websites.

RESULTS:

The eight-item SCI (concerns about getting to sleep, remaining asleep, sleep quality, daytime personal functioning, daytime performance, duration of sleep problem, nights per week having a sleep problem and extent troubled by poor sleep) had robust internal consistency (α≥0.86) and showed convergent validity with the Pittsburgh Sleep Quality Index and Insomnia Severity Index. A two-item short-form (SCI-02: nights per week having a sleep problem, extent troubled by poor sleep), derived using linear regression modelling, correlated strongly with the SCI total score (r=0.90).

CONCLUSIONS:

The SCI has potential as a clinical screening tool for appraising insomnia symptoms against Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) criteria.

KEYWORDS:

Psychiatry; Sleep Medicine

PMID:
24643168
PMCID:
PMC3964344
DOI:
10.1136/bmjopen-2013-004183
[Indexed for MEDLINE]
Free PMC Article

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