Fig. 1

Schedule of enrolment, intervention, and assessments. Legend: *only for the experimental (active) condition. Booster sessions at 1- and 3-month follow-ups are considered as part of the intervention: T0 = baseline; T1 =post-intervention; T2 = before 1st booster session; T3 = before 2nd booster session; T4 = 12-week follow-up; T5 = 24-week follow-up. MITIG.RA, Compassion and Mindfulness Intervention for Rheumatoid Arthritis; TAU, treatment-as-usual; RAID, Rheumatoid Arthritis Impact of Disease; DAS28CRP3v, Disease Activity Score using 28 joints and C reactive protein and three variables; PGA, Patient Global Assessment of disease activity; PESS, Patient Experienced Symptom State; HADS, Hospital Anxiety Depression Scale; SCS-sv, Self-Compassion Scale; CompACT, Comprehensive Assessment of Acceptance and Commitment Therapy