Table 2. TIDieR-checklist, template for intervention description and replication.

Description of content and delivery components.

Author	Item 1+2, Brief name and Why	Item 3+4, What (materials and procedures)	Item 5, Who provided	Item 6, How	Item 7, Where	Item 8, When and How much	Item 9 + 10, Tailoring and Modification	Item 11, Strategies to improve or maintain intervention fidelity and adherence	Item 12, Extent of intervention fidelity and adherence
Astin et al. 2003 [34]	Mindfulness Meditation Plus Qigong Movement Therapy. Aim: to test the potential effect of Mindfulness and Qigong	First 90 minutes of each session based on MBSR, followed by 60 minutes introduction to qigong	Mindfulness instructors not reported. Qigong taught by Chinese master	Group—based (n = 10–20)	University	8 weeks, 8 2.5-hours, All-day retreat not reported	Not reported	Not reported	26% never attended a class. Of 128 randomized into 2 groups, 50 (39%) dropped out from the study prior to 'end of treatment', 61 (48%) dropped out by week 16, and 63 (49%) failed to complete 24 week assessment
Cash et al. 2015 [41]	MBSR alleviates FM symptoms in women. Aim: to test MBSR on physiological effects	MBSR (5). Home practice assignments	Trained MBSR instructors	Group-based (n = 10–12)	University	8 weeks, 8 2.5-hours, All-day retreat reported	Not reported	Attendance monitored and absent participants received a reminder phone call to attend subsequent sessions	Of 51 randomized to intervention 42 (82%) completed 5.5 sessions. Attendance rate dropped from 90% to 57% by 4th meeting and maintained between 57 and 65%. 68% of controls provided follow-up data
Grossman et al. 2007 [35]	MBSR for FM. Aim: to compare MBSR to an active control including social support, relaxation and stretching exercises	MBSR (5). Home practice assignments	Trained MBSR instructors	Group-based (n = 10–15)	Not reported	8 weeks, 8 2.5-hours, All-day retreat reported	Not reported	Semi-structured individual interviews by instructor before/after intervention on health-related problems and expectations	Of the 58 participants, 6 (10.3%) dropped out (4 from MBSR and 2 from control). All remaining participants completed at least four sessions
Luciano et al. 2014 [36]	Effectiveness of group ACT for FM. Aim: extend findings of Wicksell 2012 with larger sample, longer follow-up and pharmacological control	ACT (7). Home practice assignments	Trained ACT instructors	Group-based (n = 10–15)	Not reported	8 weeks, 8 2.5-hours	Not reported	Video recording of instructors in sessions to insure fidelity. Interview with the participants at baseline	Of 142 participants randomized into 3 groups 20 dropped out of the study. 45 (88%) in GACT, 44 (85%) in RPR, and 47 (89%) in WL completed the study
Parra Delgado et al. 2013 [37]	Effectiveness of MBCT in the treatment of FM. Aim: to examine whether MBCT may reduce the impact of the illness	MBCT (6). Home practice assignments	Trained MBCT instructors	Group-based (n = 17)	Not reported	8 weeks, 8 2.5-hours, All-day retreat not reported	Pain experience acceptance in different mediation practices, awareness of pain-related automatic thought, information on anxiety	Not reported	15 of 17 randomized to intervention group, participated. Drop-out reasons not explained. Ten attended six or more sessions (one attended four, sessions, four five, five six, three seven and two eight sessions. Controls: treatment-as-usual (n = 16), no drop-out
Schmidt et al. 2011 [38]	MBSR on FM. Aim: to include control group to replicate and extend earlier trials lacking randomization or control group	MBSR (5). Home practice assignments	Trained MBSR instructor	Group-based (n = 12)	University	8 weeks, 8 2.5-hours, All-day retreat reported	Not reported	Semi-structured individual interviews by instructor before/after intervention to help participants formulate realistic individual goals for the intervention	Of 137 participants, 25 (18%) dropped out. Similar attendance rate for both interventions (three-armed RCT)
Septhon et al. 2007 [39]	Evaluate whether MBSR provides advantage over standard treatment for depressive symptoms. Aim: to test the effects of MBSR on depressive symptoms	MBSR (5). Home practice assignments	Trained MBSR instructor	Group-based (n = 10–12)	Not reported	8 weeks, 8 2.5-hours, All-day retreat reported	Not reported	Attendance monitored and absent participants received phone call reminder for subsequent sessions	Of 91 treatment participants, 42 (46%) were considered to have completed MBSR during at least 4 of 8 weekly group sessions. Nine attended 4 sessions (18%)
Simister et al. 2018 [42]	RCT of Online ACT for FM. Aim: to evaluate the efficacy of an online ACT protocol	Online ACT (7). Homework exercises	Online platform with seven modules. Each contained written content, mp3 files and videos developed for each module	Online	Access to computer	Participants had two months to complete the program, encouraged to use approx. one week to complete each module	Online ACT protocol modified after clinical pilot study	Treatment team provided weekly e-mail reminders to complete the program and a reminder to contact a team member if any questions or concerns	All 67 intervention group participants accessed the program during treatment period. 60% practiced exercises from ACT components at least once per day, 80% more than once a week
Wicksell et al. 2012 [40]	ACT for FM Aim: to evaluate the efficacy of ACT for FM	ACT (7)	Trained ACT instructors	Group-based (n = 6)	Not reported	12 weeks, 12 1,5-hours sessions	Not reported	If unable to attend a group session, individual 30-min session summary was provided prior to next session. Video recording of instructors in sessions to assess treatment integrity	3 of 23 participants (13%) in the intervention group dropped out during treatment. One of 17 dropped out in the waitlist group

FM = fibromyalgia, MBSR = mindfulness-based stress reduction, MBCT = mindfulness-based cognitive therapy, RCT = randomized controlled trial, ACT = acceptance and commitment therapy