Fig. 1.

SPIRIT flow diagram: Schedule of enrollment, interventions and assessments. t₁ = baseline evaluation; 0 = randomization process; t₂ = post-treatment evaluation; t₃ = follow-up evaluation; t₄ = waitlist group participants receive treatment; VAS pain = visual analogue scale for pain; PDI = Pain Disability Index; FIQ = Fibromyalgia Impact Questionnaire; CTQ = Childhood Trauma Questionnaire; PTSD = Post-traumatic Stress Disorder; EGEP-5 = Evaluación General del Estrés Postraumático; IES-R = Impact Event Scale-Revised; SUD = Subjective Units of Distress; DES = Dissociative Experiences Scale; SDQ-20 = Somatoform Dissociation Scale; MINI = MINI International Neuropsychiatric Scale; HADS = Hospital Anxiety and Depression Scale; AIS = Athens Insomnia Scale; SWLS = Satisfaction With Life Scale