The authors reported using a five week baseline, two week intensive treatment, and five week consolidation with a ten month follow up. Video recording of reading and conversation tasks were done by participants. The authors reported significant treatment effect for participants in the short and medium terms; longer term data was not available. The project began with three participants; one completed all required recordings.
Fry, J., Millard, S. and Botterill, W. (2013), Effectiveness of intensive, group therapy for teenagers who stutter. International Journal of Language & Communication Disorders. doi: 10.1111/1460-6984.1205