Mark Sherer1, Angelle M Sander1,2, Jennie Ponsford3, Leia Vos4,5, Julia M P Poritz6, Esther Ngan7, Luis Leon Novelo7. 1. TIRR Memorial Hermann, Houston, TX, USA. 2. H. Ben Taub Department of Physical Medicine and Rehabilitation, Baylor College of Medicine & Harris Health System, Houston, TX, USA. 3. Monash-Epworth Rehabilitation Research Centre, Epworth Healthcare, Turner Institute of Brain and Mental Health, School of Psychological Sciences, Monash University, Melbourne, VIC, Australia. 4. Acute Mental Health, Neuropsychology, Zablocki (Milwaukee) VA Medical Center, Milwaukee, WI, USA. 5. Department of Psychiatry and Behavioral Medicine, Medical College of Wisconsin, Milwaukee, WI, USA. 6. Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, TX, USA. 7. Department of Biostatistics and Data Science, School of Public Health, University of Texas Health Science Center, Houston, TX, USA.
Abstract
OBJECTIVE: To determine clinically meaningful subgroups of persons with traumatic brain injury (TBI) who have failed performance validity testing. METHOD: Study participants were selected from a cohort of 674 participants with definitive medical evidence of TBI. Participants were those who failed performance validity testing (the Word Memory Test, using the standard cutoffs). Participants were administered cognitive tests and self-report questionnaires. Test and questionnaire results were summarized as 12 dimension scores. Cluster analysis using the k-means method was performed. RESULTS: Cluster analysis for the 143 retained participants indicated three subgroups. These subgroups differed on patterns of scores. Subgroup 1 was impaired for memory and had no excessive complaints. Subgroup 2 had impaired memory and processing speed as well as concern regarding cognition function. Subgroup 3 showed impairment on all cognitive tests and excess complaints in multiple areas. CONCLUSIONS: These results provide a preliminary basis for improved understanding of poor performance validity.
OBJECTIVE: To determine clinically meaningful subgroups of persons with traumatic brain injury (TBI) who have failed performance validity testing. METHOD: Study participants were selected from a cohort of 674 participants with definitive medical evidence of TBI. Participants were those who failed performance validity testing (the Word Memory Test, using the standard cutoffs). Participants were administered cognitive tests and self-report questionnaires. Test and questionnaire results were summarized as 12 dimension scores. Cluster analysis using the k-means method was performed. RESULTS: Cluster analysis for the 143 retained participants indicated three subgroups. These subgroups differed on patterns of scores. Subgroup 1 was impaired for memory and had no excessive complaints. Subgroup 2 had impaired memory and processing speed as well as concern regarding cognition function. Subgroup 3 showed impairment on all cognitive tests and excess complaints in multiple areas. CONCLUSIONS: These results provide a preliminary basis for improved understanding of poor performance validity.
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