Schmidt 2011.

Methods	RCT; 3 arms; mindfulness‐based stress reduction, active relaxation control, waiting list; post‐treatment, 2‐month follow‐up
Participants	End of treatment n = 148 Start of treatment n = 177 Sex: 177 F; 0 M Mean age = 52.5 (SD 9.6) Source = newspapers, GP and specialist referrals, patient self help groups Diagnosis = fibromyalgia Mean years of pain: 4.0 (SD 3.9)
Interventions	Mindfulness‐based stress reduction; active control (relaxation, support and education); waiting list
Outcomes	Primary pain outcome: Pain Perception Scale (sensory) Primary disability outcome: Fibromyalgia Impact Questionnaire Primary mood outcome: CES‐D Catatrophising outcome: none Pain Perception Scale (Sensory and Affective) Fibromyalgia Impact Questionnaire Depression: CES‐D Anxiety: Trait Sub‐scale STAI Pittsburgh Sleep Quality Index Health‐related Quality of Life Freiburg Mindfulness Inventory Physical symptoms: Giessen Complaint Questionnaire Ongoing therapies, medical visits and medication Medication diary Goal‐attainment scaling by interview
Notes	Active relaxation control versus waiting list; analyses 7.1, 7.2, 7.3 2011 update search Yates quality scale: total quality = 31/35, design quality = 23/26, treatment quality = 8/9
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	“randomized in blocks by a computer algorithm”
Allocation concealment (selection bias)	Low risk	Patients and personnel blinded to treatment allocation
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Attrition fully reported; no test for differences
Selective reporting (reporting bias)	Low risk	Fully reported
Blinding of outcome assessment (detection bias) All outcomes	Low risk	Assessors blinded