Socio-demographic determinants in the evolution of pain in inflammatory rheumatic diseases: results from ESPOIR and DESIR cohorts

Sushmithadev Kumaradev, Christian Roux, Jérémie Sellam, Serge Perrot, Thao Pham, Aline Dugravot, Anna Molto, Sushmithadev Kumaradev, Christian Roux, Jérémie Sellam, Serge Perrot, Thao Pham, Aline Dugravot, Anna Molto

Abstract

Objective: To determine whether socio-demographic factors are associated with heterogeneity in pain evolution in inflammatory rheumatic diseases (IRDs) after accounting for disease-specific characteristics in a system with universal health care.

Methods: This analysis included the data from two prospective observational cohorts of early IRDs (ESPOIR for early RA and DESIR for early SpA). Data on pain was measured, respectively, on 13 and 9 occasions spanning 10 and 6 years of follow-up using the Short-Form 36 bodily pain score for 810 participants of ESPOIR, and 679 participants of DESIR. Linear mixed models were used to characterize differences in pain evolution as a function of age (tertiles), sex, ethnicity, education, marital, and professional status, after accounting for disease-related, treatment, lifestyle, and health factors.

Results: While transitioning from early (disease duration ≤6 months for RA and ≤3 years for SpA) to long-standing disease, differences in pain evolution emerged as a function of age (P < 0.001), sex (P = 0.050), and ethnicity (P = 0.001) in RA, and as a function of age (P = 0.048) in SpA; younger age, males, and Caucasians exhibited lower pain in the latter phases of both diseases. Highly educated participants (RA, β = -3.8, P = 0.007; SpA, β = -6.0, P < 0.001) for both diseases, and Caucasians (β = -5.6, P = 0.021) for SpA presented with low pain early in the disease, with no changes throughout disease course.

Conclusion: Being older, female, non-Caucasian and having lower education was found to be associated with worse pain in early and/or long-standing IRDs, despite universally accessible health-care. Early identification of at-risk populations and implementation of multidisciplinary strategies may reduce patient-reported health outcome disparities.

Trial registration registrations: ESPOIR: ClinicalTrials.gov, www.clinicaltrials.gov, NCT03666091. DESIR: ClinicalTrials.gov, www.clinicaltrials.gov, NCT01648907.

Keywords: pain evolution; pain outcome; rheumatoid arthritis; socio-demographic factors; spondyloarthritis.

© The Author(s) 2021. Published by Oxford University Press on behalf of the British Society for Rheumatology.

Figures

Fig. 1
Fig. 1
Evolution of SF-36 bodily pain by socio-demographic subgroups from inclusion to up to 10 years in RA (ESPOIR cohort) *P for difference in pain trajectories/evolution (drawn from testing the interactions between socio-demographic factor and slope terms using the Wald test). Analysis adjusted for socio-demographic factors (sex, age, ethnicity, education, professional and marital status assessed at inclusion) and their interaction with slope terms (time, time2 and time3), and disease-related (symptom duration, ESR, tender and swollen joint count, presence of radiographic structural lesions, RF positivity, ACPA positivity), treatment (anti-inflammatory and analgesic agents), lifestyle-related (BMI, smoking, and alcohol consumption status) and health factors (rheumatic disease comorbidity index). Disease-related, treatment, lifestyle-related and health factors were time-dependent, with some exceptions (symptom duration and ACPA positivity at baseline and their interactions with slope terms) were used in analysis. The tables beneath the figures indicate the total number of participants by socio-demographic subgroups contributing at least once to the analysis for every 2 years from year 0 to 10. Estimates came from Margins command in STATA. SF-36, short-form 36.
Fig. 2
Fig. 2
Evolution of differences in SF-36 bodily pain by socio-demographic subgroups in RA and SpA Analysis adjusted for socio-demographic factors (sex, age, ethnicity, education, professional and marital status assessed at inclusion) and their interaction with slope terms (time, time2 and time3), and disease-related, treatment, lifestyle-related, and health factors. The green line represents the ESPOIR cohort and the red line the DESIR cohort. SF-36, short-form 36
Fig. 3
Fig. 3
Evolution of SF-36 bodily pain by socio-demographic subgroups from inclusion to up to 6 years in SpA (DESIR cohort) * P for difference in pain trajectories/evolution (drawn from testing the interactions between socio-demographic factor and slope terms using Wald test). Analysis adjusted for socio-demographic factors (sex, age, ethnicity, education, professional and marital status assessed at inclusion) and their interaction with slope terms (time, time2, and time3), and disease-related (symptom duration, CRP, arthritis, synovitis, and enthesitis indices, presence of sacroilitis, human leukocyte antigen B27 positivity), treatment (anti-inflammatory and analgesic agents), lifestyle-related (BMI, smoking, and alcohol consumption status), and health factors (rheumatic disease comorbidity index). Disease-related, treatment, lifestyle-related and health factors were time-dependant with some exceptions (symptom duration, presence of sacroilitis and human leukocyte antigen B 27 positivity at baseline and their interaction with slope terms) were used in analysis. The tables beneath the figures indicate the total number of participants by socio-demographic sub-groups contributing at least once to the analysis by every year from year 0 to 6. Estimates came from Margins command in STATA.

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Source: PubMed

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