Psychometric Characteristics of the Insomnia Severity Index in Veterans With History of Traumatic Brain Injury. Issue 1 (2nd January 2019)

• Record Type: Journal Article
• Authors: Kaufmann, Christopher N.; Orff, Henry J.; Moore, Raeanne C.; Delano-Wood, Lisa; Depp, Colin A.; Schiehser, Dawn M.
• Is Part Of: Behavioral sleep medicine. Volume 17:Issue 1(2019)
• Page Start: 12
• Page End: 18
• Publication Date: 2019-01-02
• Subjects: Sleep disorders -- Periodicals; Sleep -- Psychological aspects -- Periodicals; 616.8498
• DOI: 10.1080/15402002.2016.1266490
• Languages: English
• ISSNs: 1540-2002

Abstract

ABSTRACT: Objective/Background : 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. Participants : Eighty-three veterans with history of TBI were seen in the VA San Diego Healthcare System as part of a research protocol. Methods : 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. Results : 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. Conclusions : 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.