Effectiveness of time-limited psychotherapy for minor psychiatric disorders: randomised controlled trial evaluating immediate v. long-term effects.

Background: Psychotherapy research rarely has studied outcome in the longer term.

Aims: To evaluate the effectiveness of brief group dynamic psychotherapy (BGDP) intervention in patients with minor psychiatric disorders compared with the usual clinical management shortly after treatment termination and to investigate whether intervention would show a differential effect at 2-year follow-up.

Method: Patients were allocated randomly to an experimental or control group.