Introduction: Low back pain is the leading cause of disability globally. Patient reported outcome measurements show the clinicians the patients perspective of health related quality of life. Questionnaires could help physicians inndividual therapeutic decision making process.
Aims: PROMIS-29 is a short instrument including seven health domains and a pain intensity numeric rating scale that could be used in spine surgery. We show the psychometric properties of this measurement in order to apply it in the everyday clinical practice.
Methods: Participants completed paper-pencil version of PROMIS-29 Profile alongside legacy questionnaires Research and Development (RAND)-36, Oswestry Disability Index, General Anxiety Disorder-7 scale, VAS, Patient Health Questionnaire-9 scale. Reliability was evaluated by calculating internal consistency and intraclass correlation coefficients. We used confirmatory factor analysis to show structural validity. Construct validity was assessed by evaluating discriminant and convergent validity using Spearman’s rank correlation and by performing known-groups comparisons with analysis of variance.
Result: Mean (SD) age of the 131 participants was 54 (16), 62% were female. Test–retest reliability was excellent (ICC>0.97). Internal consistency of each PROMIS domain was high (Cronbach’s α>0.89 for all). Confirmatory factor analysis showed good structural validity (CFI>0.96, RSMR<0.026 for all domains). All measured PROMIS T-scores strongly correlated with the corresponding legacy instrument measuring the same construct, indicating excellent convergent validity, while PROMIS domain T-scores shows moderate to weak correlations with the questionnaires measuring different traits.
Conclusion: We present data supporting the psychometric ability of the Hungarian PROMIS-29 Profile short forms in patients with chronic low back pain. This instrument could be be useful for research and clinical applications in spine care.
Funding: This project received partial funding from EFOP-3.6.3-VEKOP-16-2017-00009 scholarship.