A review of scientific literature compared recovery rates for various modalities of therapy:
Psychoanalysis recovery rate was 38% after 600 sessions.
Behaviour therapy recovery rate was 72% after an average of 22 sessions.
Hypnotherapy recovery rate was 93% after of 6 sessions.

A note about the negative correlation between number of sessions and percentage recovery rate. At first sight this seems paradoxical. However, if a form of therapy is truly effective, it should not only increase recovery rate, but also shorten the number of sessions necessary (as well as widen the range of cases treatable).
Recovery Rates – Psychoanalysis
Based on psychoneurotic patients studied (Wolpe, Salter, and Reyna, 1964), the number of patients cured or much improved by psychoanalysis was 45% in one study involving 534 patients and 31% in the other study involving 595 patients (the only two large scale studies in the literature on psychoanalysis). The average duration of treatment for the improved patients (given only for the first study) was three to four years at an average of three to four sessions per week, or an average of approximately 600 sessions per patient.
Recovery Rates – Behavioural Therapy
Based on Wolpe’s study, patient recovery rate was 65% involving 295 patients (usually reported as 90% of 210 patients) and 78% in a study by Lazarus involving 408 patients. The duration of treatment for the improved patients was an average of thirty sessions in the former and fourteen in the latter.
Recovery Rates – Hypnotherapy
Three large scale hypnotherapy studies contained basic findings. Richardson’s (1963) study dealt with 76 of frigidity. He reports 94.7% of the patients improved. The average number of sessions needed was 1.53. The criterion for judging improvement was increase in percentage of orgasms. The percentage of orgasms rose from a pre-treatment average of 24% to a post-treatment average of 84%. Follow-ups (exact length not given) showed that only two patients were unable to continue realizing climaxes at the same percentages as when treatment terminated. Richardson’s method of treatment was a combination of direct symptom removal, uncovering, and removal of underlying causes, since he had found that direct symptom removal alone was not always sufficient. He reports no hypnotic induction failures.
Another study covered 108 patients suffering from asthma, insomnia, alcoholism, dysmenorrhea, dermatitis, anxiety state, and impotence. The percentage of patients reported improved was 90%. The average number of sessions was five. The criteria for judging improvement were removal or improvement of symptoms. The average follow-up period was nine months. The method of treatment was a three-fold approach. With some patients he would work on reeducating the patient with regard to the behavior patterns immediately underlying the symptoms. With others he would first regress the patient back to the original onset of the symptom. Once regressed, the patient would be reeducated to the fact that the original cause was no longer operative. In addition, he usually used supplementary suggestions of direct symptom removal.
Hussain’s (1964) study reports on 105 patients suffering from alcoholism, sexual promiscuity, impotence and frigidity, sociopathic personality disturbance, hysterical reactions, behavior disorders of school children, speech disorders, and a number of different psychosomatic illnesses. The percentage of patients reported improved was 95.2%. The number of sessions needed ranged from four to sixteen. The criteria for judging improvement were complete or almost complete removal of symptoms.
Summary
Averaging the above figures, we find that for psychoanalysis we can expect a recovery rate of 38% after approximately 600 sessions.
For behavioural therapy, we can expect a recovery rate of 72% after an average of 22 sessions, and for hypnotherapy we can expect a recovery rate of 93% after an average of 6 sessions.
Source: Barrios, Alfred A. “Hypnotherapy: A Reappraisal,” Psychotherapy: Theory, Research and Practice (1970)
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