Psychometric properties of the PROMIS® v2.0 Cognitive Function Short Form (SF-8) in a Mexican cancer population

Background: People with cancer present subjective cognitive complaints during or after cancer treatment that can affect their quality of life. The evaluation of these through self-report instruments allows their referral to neuropsychological care. Objective: To determine the psychometric properties of PROMIS (R) v2.0 Cognitive Function Brief Form (SF-8) in a sample of Mexican patients with cancer. Method: 200 people with an average age of 46.34, mostly in stages II and III, in active treatment or follow-up. Design: Instrumental. non-experimental cross-sectional. Instruments: SF-8 and Effects on quality-of-life subscale of the Cancer Therapy Functional Assessment Instrument-Cognitive Function. Analysis: Factor structure. confirmatory factor analysis and concurrent validity test. Results: An unifactorial model was obtained that explained 73.27% of the variance, internal consistency index alpha = 0.99, with high factorial loads (0.69, -0.92), which was corroborated with the confirmatory analysis, with excellent adjustment indexes. The correlation between instruments was r: 0.69 (p < 0.01). Conclusions: The Mexican version of the SF-8 is a valid and reliable instrument for the measurement of subjective cognitive complaints, so its use in the clinical and research field is recommended.