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Behav Sleep Med. 2019 Jan-Feb;17(1):12-18. doi: 10.1080/15402002.2016.1266490. Epub 2017 Jan 18.

Psychometric Characteristics of the Insomnia Severity Index in Veterans With History of Traumatic Brain Injury.

Kaufmann CN1,2,3, Orff HJ1,4, Moore RC1,2,3, Delano-Wood L1,2,4, Depp CA1,2,3, Schiehser DM1,2,4.

Author information

1
a Veterans Administration San Diego Healthcare System , La Jolla , California.
2
b Department of Psychiatry , University of California , San Diego , La Jolla , California.
3
c Stein Institute for Research on Aging , University of California , San Diego , La Jolla , California.
4
d Center of Excellence for Stress and Mental Health , Veterans Administration San Diego Healthcare System , La Jolla , California.

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.

PMID:
28098495
PMCID:
PMC5740012
DOI:
10.1080/15402002.2016.1266490
[Indexed for MEDLINE]
Free PMC Article

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