title: The Sleep Condition Indicator: a clinical screening tool to evaluate insomnia disorder.
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.
  
  
  METHODS
  The SCI was evaluated across five study samples. Content validity, internal consistency and concurrent validity were investigated.
  
  
  METHODS
  30 941 individuals (71% female) completed the SCI along with other descriptive demographic and clinical information.
  
  
  METHODS
  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.
authors.affiliation: Nuffield Department of Clinical Neurosciences/Sleep & Circadian Neuroscience Institute, University of Oxford, UK.
authors.forename: Colin A
authors.initials: CA
authors.lastname: Espie
authors.forename: Simon D
authors.initials: SD
authors.lastname: Kyle
authors.forename: Peter
authors.initials: P
authors.lastname: Hames
authors.forename: Maria
authors.initials: M
authors.lastname: Gardani
authors.forename: Leanne
authors.initials: L
authors.lastname: Fleming
authors.forename: John
authors.initials: J
authors.lastname: Cape
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D011594:Psychometrics / Q000379:methods; D015203:Reproducibility of Results; D012720:Severity of Illness Index; D012890:Sleep; D007319:Sleep Initiation and Maintenance Disorders / Q000175:diagnosis*; D012893:Sleep Wake Disorders; D011795:Surveys and Questionnaires / Q000592:standards*; D055815:Young Adult
keywords: Psychiatry; Sleep Medicine