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Iverson G, Marsh J, Connors E, Terry D, A-237 Investigating the Reliability and Item-Level Symptom Endorsement for the PROMIS® v2.0 Cognitive Function-8-Item Short Form, Archives of Clinical Neuropsychology, Volume 35, Issue 6, September 2020, Page 1032, https://doi.org/10.1093/arclin/acaa068.237
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Abstract
We present the normative reference values, item level endorsement, and the internal consistency reliability of the PROMIS® v2.0 Cognitive Function-8-Item Short Form.
The PROMIS® v2.0 Cognitive Function 8-Item Short Form measures subjective cognitive difficulties (raw score range = 8–40). A cohort of 1,009 adults (51.1% women) from the US population completed this measure. The total sample was stratified by gender and health status for analyses. A healthy subgroup (n = 475; 49.5% women) reported no personal history of mental health, neurological, or sleep disorders and rated their overall health, functioning, and quality of life as “good” or better.
The healthy group reported less cognitive symptoms (i.e., higher raw score) than the total sample (total sample, M = 32.17, SD = 7.57, Md = 34; healthy sample, M = 35.02, SD = 5.94, Md = 38). This pattern was shown in men [all men, M = 31.06, SD = 7.68, Md = 32; healthy men, M = 33.95, SD = 6.34, Md = 36] and women [all women, M = 33.23, SD = 7.32, Md = 36; healthy women, M = 36.12, SD = 5.30, Md = 39]. The base rates for endorsing three or more cognitive symptoms were consistently lower among the healthy samples (total sample = 14.8%, total healthy sample = 4.8%, all men = 19.7%, healthy men = 7.5%, all women = 10.1%, and healthy women = 2.1%). Internal consistency, as measured by Cronbach’s alpha, ranged from 0.89 to 0.95 depending on subgroup.
The PROMIS® v2.0 Cognitive Function 8-Item Short Form is a reliable self-report measure of cognitive difficulties. Participants who reported their overall health status to be good tended to report less cognitive difficulties. The presented normative reference values can be useful in both research and clinical practice when assessing cognition in the general population.
