Effectiveness of Psychotherapy

CBT Research Regarding Positive Outcomes and Dose Effectiveness in Psychotherapy


How Much Therapy Is Really Enough?

A Session-by-Session Analysis of the Psychotherapy Dose-Effect Relationship
Scott W. Kadera B. S.1, Michael J. Lambert PH. D.1, and Alison A. Andrews B. S.1
Journal of Psychotherapy Practice and Research 5: 132-151, 1996

  • Previous investigations of the dose-effect relationship in psychotherapy suggest that therapeutic benefits occur early in treatment.
  • Approximately 25% of patients have been estimated to improve after 1 session, and 50% improve by 8 sessions. The aim of this study was to compare such estimates with the actual performance of outpatients in therapy. Forty-five patients seen at an outpatient clinic were monitored session by session for evidence of clinically significant change.

Current Findings Regarding the Effectiveness of Counseling: Implications for Practice

Lambert and Thompson
Journal of Counseling and Development, Vol. 74, 1996

  • Is Counseling Effective? Does Counseling help the client to cialis generique solve problems, reduce symptoms, and improve interpersonal functioning?
  • In this analysis, 50% of clients showed “clinically significant change” within 10 sessions, and 80% showed clinically significant change within 15 sessions. See Graph Below


The Dose Response Relationship in Psychotherapy: Implications for Social Policy

Dr Paul Harnetta*, Analise O’Donovanb & Michael J. Lambertc
Clinical Psychologist
Volume 14, Issue 2, 2010

  • The principle aim of this study was to estimate the number of sessions of psychotherapy needed for clients suffering from psychiatric illness to return to a normal state of functioning or reliably improve. For patients to return to normal functioning levels it was estimated that it would take about 8 sessions for 50% of clients to show reliable improvement and 21 sessions for about 85% to meet this criterion. Recovery took more treatment, with 50% of clients estimated to recover after 14 sessions and 70% requiring 23. The findings of the current study are roughly consistent with those found elsewhere and suggest a minimum benefit should be closer to 20 sessions.

In Therapy Forever? Enough Already

New York Times Online

  • A 2001 study published in the Journal of Counseling Psychology found that patients improved most dramatically between their seventh and tenth sessions.
  • As CBT Therapists are a dynamic part of the treatment process… A recent study by the National Institute for Health and Welfare in Finland found that “active, engaging and extroverted therapists” helped patients more quickly in the short term than “cautious, nonintrusive therapists.”