title: Psychometric Characteristics of the Insomnia Severity Index in Veterans With History of Traumatic Brain Injury.
abstract: The Insomnia Severity Index (ISI) is a widely used self-report measure of insomnia symptoms. However, to date this measure has not been validated or well-characterized in veterans who have experienced traumatic brain injury (TBI). This study assessed the psychometric properties and convergent, divergent, construct, and discriminate validity of the ISI in veterans with a history of TBI.
  
  
  
  Eighty-three veterans with history of TBI were seen in the VA San Diego Healthcare System as part of a research protocol.
  
  
  
  Measures included the ISI, Pittsburgh Sleep Quality Index (PSQI), Epworth Sleepiness Scale, Neurobehavioral Symptom Inventory, Beck Depression Inventory-II, Beck Anxiety Inventory, and PTSD Checklist-Military Version.
  
  
  
  The ISI demonstrated moderate to strong or excellent convergent and divergent validity. A principal component analysis indicated a single construct with excellent internal consistency (Cronbach's alpha = 0.92). In exploratory analyses, the ISI discriminated well between those with (73%) and without (27%) sleep disturbance based on the PSQI.
  
  
  
  Results from this study indicate validity of the ISI in assessing insomnia in veterans with history of TBI and suggest a cutoff score not dissimilar from non-TBI populations. Findings from this study can help inform clinical applicability of the ISI, as well as future studies of insomnia in TBI.
authors.affiliation: a Veterans Administration San Diego Healthcare System , La Jolla , California.|b Department of Psychiatry , University of California , San Diego , La Jolla , California.|c Stein Institute for Research on Aging , University of California , San Diego , La Jolla , California.
authors.forename: Christopher N
authors.initials: CN
authors.lastname: Kaufmann
authors.affiliation: a Veterans Administration San Diego Healthcare System , La Jolla , California.|d Center of Excellence for Stress and Mental Health , Veterans Administration San Diego Healthcare System , La Jolla , California.
authors.forename: Henry J
authors.initials: HJ
authors.lastname: Orff
authors.affiliation: a Veterans Administration San Diego Healthcare System , La Jolla , California.|b Department of Psychiatry , University of California , San Diego , La Jolla , California.|c Stein Institute for Research on Aging , University of California , San Diego , La Jolla , California.
authors.forename: Raeanne C
authors.initials: RC
authors.lastname: Moore
authors.affiliation: a Veterans Administration San Diego Healthcare System , La Jolla , California.|b Department of Psychiatry , University of California , San Diego , La Jolla , California.|d Center of Excellence for Stress and Mental Health , Veterans Administration San Diego Healthcare System , La Jolla , California.
authors.forename: Lisa
authors.initials: L
authors.lastname: Delano-Wood
authors.affiliation: a Veterans Administration San Diego Healthcare System , La Jolla , California.|b Department of Psychiatry , University of California , San Diego , La Jolla , California.|c Stein Institute for Research on Aging , University of California , San Diego , La Jolla , California.
authors.forename: Colin A
authors.initials: CA
authors.lastname: Depp
authors.affiliation: a Veterans Administration San Diego Healthcare System , La Jolla , California.|b Department of Psychiatry , University of California , San Diego , La Jolla , California.|d Center of Excellence for Stress and Mental Health , Veterans Administration San Diego Healthcare System , La Jolla , California.
authors.forename: Dawn M
authors.initials: DM
authors.lastname: Schiehser
mesh_terms: D000328:Adult; D000070642:Brain Injuries, Traumatic / Q000150:complications* / Q000473:pathology / Q000523:psychology; D005260:Female; D006801:Humans; D008297:Male; D011594:Psychometrics / Q000379:methods*; D015203:Reproducibility of Results; D057566:Self Report; D012720:Severity of Illness Index; D007319:Sleep Initiation and Maintenance Disorders / Q000175:diagnosis* / Q000473:pathology; D014728:Veterans / Q000523:psychology*