Twenty-six young participants, 18-25 years, with social phobia (SP) were randomly assigned to eight 2-hour sessions of group mindfulness-based cognitive therapy (MBCT) and twelve 2-hour sessions of group cognitive-behavioral therapy (CBT) in a crossover design with participants receiving treatments in reversed order. Outcome was assessed after treatments, and at 6- and 12-month follow-ups. MBCT achieved moderate-high pre-post effect sizes (d=0.78 on a composite SP measure), not significantly different from, although numerical lower than those of CBT (d=1.15). Participants in both groups further improved in the periods following their first and second treatment until 6-months follow-up (pre-follow-up ds = 1.42 and 1.62). Thus, MBCT might be a useful, low cost treatment for SP, although, probably, less efficacious than CBT.
The meta-analysis revealed a small overall effect of using the PCOMS, but no effect in psychiatric settings. The positive results in counseling settings might be biased due to researcher allegiance and use of the ORS as the only outcome measure.
Generally, the results are in line with the conclusion that more disturbed patients with SP both begin and end treatment at a higher symptomatic level but with a similar degree of improvement. There is, however, little clinically or theoretically relevant knowledge to be gained from existing studies of pre-treatment patient variables as predictors of drop-out and treatment outcome in CBT for patients with SP. The field is in need of conceptual and methodological improvements if more solid findings should be hoped for.
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