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

Espie, Colin A and Kyle, Simon D and Hames, Peter and Gardani, Maria and Fleming, Leanne and Cape, John (2014) The Sleep Condition Indicator : a clinical screening tool to evaluate insomnia disorder. BMJ Open, 4 (3). pp. 1-5. e004183. ISSN 2044-6055 (https://doi.org/10.1136/bmjopen-2013-004183)

[thumbnail of Espie-etal-BMJO-2014-The-Sleep-Condition-Indicator]
Preview
Text. Filename: Espie_etal_BMJO_2014_The_Sleep_Condition_Indicator.pdf
Final Published Version
License: Creative Commons Attribution-NonCommercial 3.0 logo

Download (509kB)| Preview

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.