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The Development of a New Computer-Adaptive Test to Evaluate Strain in Caregivers of Individuals With TBI: TBI-CareQOL Caregiver Strain.
Archives of Physical Medicine and Rehabilitation 2018 August 26
OBJECTIVE: To develop a new measure of caregiver strain for use in caregivers of individuals with traumatic brain injury (TBI), Traumatic Brain Injury Caregiver Quality of Life (TBI-CareQOL) Caregiver Strain.
DESIGN: Qualitative data, literature reviews, and cross-sectional survey study.
SETTING: Three TBI Model Systems rehabilitation hospitals, an academic medical center, and a military medical treatment facility.
PARTICIPANTS: Caregivers (N=560) of civilians (n=344) or service members/veterans (SMVs) with TBI (n=216).
INTERVENTIONS: Not applicable.
MAIN OUTCOME MEASURE: TBI-CareQOL Caregiver Strain Item Bank.
RESULTS: Exploratory and confirmatory factor analyses, a graded response model (GRM) and differential item functioning supported the retention of 33 items in the final measure. GRM calibration data was used to inform the selection of a 6-item static short form, and to program the TBI-CareQOL Caregiver Strain computer-adaptive test (CAT). CAT simulation analyses indicated a 0.97 correlation between the CAT scores and the full item-bank. Three-week test-retest reliability was strong (r=0.83).
CONCLUSIONS: The new TBI-CareQOL Caregiver Strain CAT and corresponding 6-item short form were developed using established rigorous measurement development standards; this is the first self-reported measure developed to evaluate caregiver strain in caregivers of individuals with TBI.
DESIGN: Qualitative data, literature reviews, and cross-sectional survey study.
SETTING: Three TBI Model Systems rehabilitation hospitals, an academic medical center, and a military medical treatment facility.
PARTICIPANTS: Caregivers (N=560) of civilians (n=344) or service members/veterans (SMVs) with TBI (n=216).
INTERVENTIONS: Not applicable.
MAIN OUTCOME MEASURE: TBI-CareQOL Caregiver Strain Item Bank.
RESULTS: Exploratory and confirmatory factor analyses, a graded response model (GRM) and differential item functioning supported the retention of 33 items in the final measure. GRM calibration data was used to inform the selection of a 6-item static short form, and to program the TBI-CareQOL Caregiver Strain computer-adaptive test (CAT). CAT simulation analyses indicated a 0.97 correlation between the CAT scores and the full item-bank. Three-week test-retest reliability was strong (r=0.83).
CONCLUSIONS: The new TBI-CareQOL Caregiver Strain CAT and corresponding 6-item short form were developed using established rigorous measurement development standards; this is the first self-reported measure developed to evaluate caregiver strain in caregivers of individuals with TBI.
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