Purpose: This study was designed to answer three questions: (a) Does percentage of syllables stuttered (%SS) differ between standard and challenge phone calls; (b) Does anxiety differ between standard and challenge phone calls; and (c) Is there a relationship between %SS and anxiety during standard and challenge phone calls? Method: Participants…

Background: Early intervention is essential healthcare for stuttering, and the translation of research findings to community settings is a potential roadblock to it. Aims: This study was designed to replicate and extend the Lidcombe Program community translation findings of O'Brian et al. (2013) but with larger participant numbers, incorporating…

Purpose: Percentage of syllables stuttered (%SS) and severity rating (SR) scales are measures in common use to quantify stuttering severity and its changes during basic and clinical research conditions. However, their reliability has not been assessed with indices measuring both relative and absolute reliability. This study was designed to provide…

Purpose: Researchers have used unscheduled telephone calls for many years during clinical trials to measure adult stuttering severity before and after treatment. Because variability is a hallmark of stuttering severity with adults, it is questionable whether an unscheduled telephone call is truly representative of their everyday speech. Method:…

Purpose: Webcam treatment is potentially useful for health care in cases of early stuttering in which clients are isolated from specialized treatment services for geographic and other reasons. The purpose of the present trial was to compare outcomes of clinic and webcam deliveries of the Lidcombe Program treatment (Packman et al., 2015) for early…

Purpose: Stuttering varies between and within speaking situations. In this study, the authors used statistical process control charts with 10 case studies to investigate variability of stuttering frequency. Method: Participants were 10 adults who stutter. The authors counted the percentage of syllables stuttered (%SS) for segments of their speech…

Background: At present, percent syllables stuttered (%SS) is the gold standard outcome measure for behavioural stuttering treatment research. However, ordinal severity rating (SR) procedures have some inherent advantages over that method. Aims: To establish the relationship between Clinician %SS, Clinician SR and self-reported Speaker SR. To…

Purpose: To investigate the impact on percentage of syllables stuttered of various durations of delayed auditory feedback (DAF), levels of frequency-altered feedback (FAF), and masking auditory feedback (MAF) during conversational speech. Method: Eleven adults who stuttered produced 10-min conversational speech samples during a control condition…

Purpose: The purpose of this study was to develop guidelines for the statistical analysis of percentage of syllables stuttered (%SS) data in stuttering research. Method; Data on %SS from various independent sources were used to develop a statistical model to describe this type of data. On the basis of this model, %SS data were simulated with…