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J Head Trauma Rehabil. 2019 Sep/Oct;34(5):353-363. doi: 10.1097/HTR.0000000000000529.

Linking the GAD-7 and PHQ-9 to the TBI-QOL Anxiety and Depression Item Banks.

Author information

1
Center for Health Assessment Research and Translation, College of Health Sciences (Drs Boulton, Tyner, and Tulsky and Ms Kisala) and Departments of Physical Therapy and Psychological & Brain Sciences (Dr Tulsky), University of Delaware, Newark; Educational Psychology Department, The University of Texas at Austin (Dr Choi); H. Ben Taub Department of Physical Medicine and Rehabilitation, Baylor College of Medicine and Harris Health System, Houston, Texas (Dr Sander); TIRR Memorial Hermann, Houston, Texas (Drs Sander and Sherer); Department of Physical Medicine and Rehabilitation, Northwestern University Feinberg School of Medicine, Chicago, Illinois (Dr Heinemann); Shirley Ryan AbilityLab, Chicago, Illinois (Dr Heinemann); Rusk Rehabilitation, NYU Langone Health, New York, New York (Dr Bushnik); Kessler Foundation, East Hanover, New Jersey (Dr Chiaravalloti); and Department of Physical Medicine & Rehabilitation, Rutgers New Jersey Medical School, Newark (Dr Chiaravalloti).

Abstract

OBJECTIVE:

To link scores on commonly used measures of anxiety (7-item Generalized Anxiety Disorder Scale; GAD-7) and depression (9-item Patient Health Questionnaire; PHQ-9) to the Traumatic Brain Injury Quality of Life (TBI-QOL) measurement system.

SETTING:

5 Traumatic Brain Injury Model Systems.

PARTICIPANTS:

A total of 385 individuals with traumatic brain injury (TBI) (31% complicated mild; 14% moderate; and 54% severe).

DESIGN:

Observational cohort.

MAIN MEASURES:

GAD-7, PHQ-9, TBI-QOL Anxiety v1.0 and TBI-QOL Depression v1.0.

RESULTS:

Item response theory-based linking methods were used to create crosswalk tables that convert scores on the GAD-7 to the TBI-QOL Anxiety metric and scores on the PHQ-9 to the TBI-QOL Depression metric. Comparisons between actual and crosswalked scores suggest that the linkages were successful and are appropriate for group-level analysis. Linking functions closely mirror crosswalks between the GAD-7/PHQ-9 and the Patient-Reported Outcomes Measurement Information System (PROMIS), suggesting that general population linkages are similar to those from a TBI sample.

CONCLUSION:

Researchers and clinicians can use the crosswalk tables to transform scores on the GAD-7 and the PHQ-9 to the TBI-QOL metric for group-level analyses.

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