Prediction of outcome after treatment for stuttering.

Predicting who will relapse after behavioural or dynamic psychotherapy is important. A search for variables likely to predict individuals at risk of relapse was conducted in two groups of successfully treated stutterers. The most powerful predictors were the attainment of three goals by the last day of treatment; namely, skill mastery as evidenced by no stuttering, normal attitudes to communication, and an internalisation of the locus of control. Of the subjects who achieved these three goals, 97% maintained their improved speech in the long term. No subject who failed to achieve any of these goals remained fluent, while those who achieved one or two goals had intermediate outcomes. No single goal was necessary and none alone was sufficient to maintain improvement. Both actual and perceived mastery over stuttering appear to be important if the long-term outcome is to be satisfactory.