No fluency but psychological turn around

This study confirms my suspicion and experience of stuttering therapies: no significant long-term improvement in fluency but improvements in psychological well-being:

An experimental clinical trial of a cognitive behaviour therapy package for chronic stuttering.
Menzies RG, O'Brian S, Onslow M, Packman A, St Clare T, Block S.
Australian Stuttering Research Centre, The University of Sydney.

PURPOSE: The aims of the present study were to: (1) examine the rate of Social Phobia among adults who stutter; (2) study the effects of speech restructuring treatment on social anxiety; (3) study the effects on anxiety and stuttering of a CBT package for social anxiety. METHOD: Thirty-two adults with chronic stuttering were randomly allocated to receive either: (1) speech restructuring following a CBT package for social anxiety, or; (2) speech restructuring alone. Data were obtained on a variety of speech and psychological measures at pre-treatment, post- CBT, post- speech restructuring and 12 months follow-up. RESULTS: Sixty percent of our cohort were diagnosed with Social Phobia. Speech restructuring treatment alone had no impact on the Social Phobia of our cohort at 12 months follow-up. At follow-up, participants who had received CBT showed: (1) no Social Phobia; (2) greater improvements than control subjects on a range of psychological measures of anxiety and avoidance. However, the CBT package made no difference to the speech outcomes of those with Social Phobia. CONCLUSIONS: The CBT treatment was associated with significant and sustained improvements in psychological functioning, but did not improve fluency.