Table 2.
Quality of the interventions.
| Study | Use of validated mindfulness or ACTa measures | Clinical training of the therapist | Mindfulness training of the therapist | Clinical training of the developer | Mindfulness training of the developer |
| Boettcher et al, 2014 [36] | No | Not reported | Not reported | General practitioner | Mindfulness-based cognitive therapy, mindfulness-based stress reduction, and other mindfulness training |
| Ly et al, 2014 [37] | AAQ-IIb | (4th year) Clinical Psychology MSc; supervised | Not specific—as part of their training | Not applicable—platform already designed | Not reported |
| Carlbring et al, 2013 [53] | No | Clinical Psychology MSc; supervised | Not specific—as part of their training | Licensed psychologist | Functional contextualism and clinical behavior analysis |
| Kivi et al, 2014 [54] | No | Licensed psychologist or psychotherapist; supervised | Specific training for the study | Licensed psychologist | Functional contextualism and clinical behavior analysis |
| Murray et al, 2015 [55] | No | Not applicable | Not reported | Clinicians, costumers, and researches | Mindfulness and ACT |
| Dahlin et al, 2016 [56] | No | Psychologist graduate students; supervised | Not specific, but some in their training | Clinical psychologist | ACT workshops |
| Gershkovich et al, 2016 [57] | AAQ-II and Philadelphia Mindfulness Scale | Clinical Psychology doctoral student who received extensive training | ACT intensive training | Clinical Psychology doctoral student | ACT |
| Gershkovich et al, 2017 [58] | No | Clinical Psychology doctoral student who received extensive training | Not reported | Not reported | Not reported |
| Houghton 2008 [52] | Kentucky Inventory Mindfulness Skills | Not applicable | Not reported | Not reported | Not reported |
| Ivanova et al, 2016 [59] | No | Clinical Psychology MSc; supervised | Not reported | Not reported | Not reported |
| Johansson et al, 2013 [60] | Five Faces of Mindfulness Questionnaire | (3rd year) Clinical Psychology doctoral MSc; supervised by experienced psychotherapist | Clinical training in affect-focused psychodynamic psychotherapy | Clinical psychologist | Affect-focused psychodynamic psychotherapy |
| Strandskov et al, 2017 [61] | No | (4th year) Clinical Psychology MSc; supervised | Not reported | Not reported | Not reported |
aACT: Acceptance and Commitment Therapy.
bAAQ-II: Acceptance and Action Questionnaire.