• Christopher N Kaufmann, Henry J Orff, Raeanne C Moore, Lisa Delano-Wood, Colin A Depp, and Dawn M Schiehser.
• a Veterans Administration San Diego Healthcare System , La Jolla , California.
• Behav Sleep Med. 2019 Jan 1; 17 (1): 12-18.

Objective/BackgroundThe 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.ParticipantsEighty-three veterans with history of TBI were seen in the VA San Diego Healthcare System as part of a research protocol.MethodsMeasures 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.ResultsThe 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.ConclusionsResults 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.

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