Sally Hewat

Prevalence of anxiety disorders among adults seeking speech therapy for stuttering

The present study explored the prevalence of anxiety disorders among adults seeking speech therapy for stuttering. Employing a matched case-control design, participants included 92 adults seeking treatment for stuttering, and 920 age- and gender-matched controls from the Australian National Survey of Mental Health and Well-being. A conditional logistic regression model was used to estimate odds ratios for Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV) and International Classification of Diseases (ICD-10) anxiety disorders. Compared with matched controls, the stuttering group had six- to seven-fold increased odds of meeting a 12-month diagnosis of any DSM-IV or ICD-10 anxiety disorder. In terms of 12-month prevalence, they also had 16- to 34-fold increased odds of meeting criteria for DSM-IV or ICD-10 social phobia, four-fold increased odds of meeting criteria for DSM-IV generalized anxiety disorder, and six-fold increased odds of meeting criteria for ICD-10 panic disorder. Overall, stuttering appears to be associated with a dramatically heightened risk of a range of anxiety disorders.

The relationship between mental health disorders and treatment outcomes among adults who stutter

UNLABELLED The ability to reduce stuttering in everyday speaking situations is the core component of the management plan of many who stutter. However, the ability to maintain the benefits of speech-restructuring treatment is known to be compromised, with only around a third of clients achieving this [Craig, A. R., & Hancock, K. (1995). Self-reported factors related to relapse following treatment for stuttering. Australian Journal of Human Communication Disorders, 23, 48-60; Martin, R. (1981). Introduction and perspective: Review of published research. In E. Boberg (Ed.), Maintenance of fluency. New York: Elsevier]. The aim of this study was to determine whether the presence of mental health disorders contributes to this failure to maintain fluency after treatment. Assessments for mental health disorders were conducted with 64 adults seeking speech-restructuring treatment for their stuttering. Stuttering frequency, self-rated stuttering severity and self-reported avoidance were measured before treatment, immediately after treatment and 6 months after treatment. Stuttering frequency and situation avoidance were significantly worse for those participants who had been identified as having mental health disorders. The only subgroup that maintained the benefits of the treatment for 6 months was the third of the participants without a mental health disorder. These results suggest that prognosis for the ability to maintain fluency after speech restructuring should be guarded for clients with mental health disorders. Further research is needed to determine the benefits of treating such disorders prior to, or in combination with, speech-restructuring. EDUCATIONAL OBJECTIVES The reader will (1) evaluate the impact of one or more mental health disorders on medium-term outcomes from speech-restructuring treatment for stuttering, (2) describe how this finding affects prognosis for certain groups of stuttering clients, (3) evaluate how these finding are consistent with estimates of post-treatment relapse after speech-restructuring treatment, (4) describe two test instruments for detecting mental health disorders, and (5) outline the findings about the relation between pre-treatment stuttering severity and mental health disorders.

Screening for personality disorders among adults seeking speech treatment for stuttering.

UNLABELLED Stuttering is frequently associated with negative consequences which typically begin in early childhood. Despite this, no previous studies have investigated the presence of personality disorders among adults who stutter. Therefore, the aims of the present study were to screen for personality disorders among adults who stutter, and to compare these screening estimates with matched controls from a national population sample. Using a matched case-control design, participants were 94 adults seeking treatment for stuttering, 92 of whom completed the International Personality Disorders Examination Questionnaire (IPDEQ) as a first-stage screener, and 920 age- and gender-matched controls from the Australian National Survey of Mental Health and Well-Being (ANSMHWB). A conditional logistic regression model was used to estimate odds ratios for the primary outcome: first-stage presence of any personality disorder; as well as specific personality disorders. Based on first-stage screening, the presence of any personality disorder was significantly higher for adults in the stuttering group than matched controls, demonstrating almost threefold increased odds. This difference between groups remained significant for all specific personality disorders, with four- to sevenfold increased odds found for Dissocial, Anxious, Borderline, Dependent and Paranoid personality disorders, and two- to threefold increased odds found for Histrionic, Impulsive, Schizoid and Anankastic personality disorders. In conclusion, stuttering appears to be associated with a heightened risk for the development of personality disorders. These results highlight the need for research regarding the assessment and treatment of personality disorders among adults who stutter. EDUCATIONAL OBJECTIVES The reader will be able to: (1) describe the nature of personality disorders, including factors thought to contribute to their development; (2) identify some of the negative consequences associated with stuttering which may contribute to the development of personality disorders among adults who stutter; (3) describe the process involved in screening for personality disorders, including various methods of scoring; and (4) summarize findings regarding the first-stage presence of personality disorders among adults seeking speech treatment for stuttering in the present sample in comparison with age- and gender-matched controls from a national population sample.

North-American Lidcombe Program file audit: Replication and meta-analysis

Thousands of North American clinicians have trained for the Lidcombe Program of Early Stuttering Intervention, yet there are no benchmark data for that continent. This retrospective file audit includes logistical regression of variables from files of 134 children younger than 6 years who completed Stage 1 of the Lidcombe Program. Benchmarking data for clinic visits to Stage 2 is available for these files. Meta-analysis supplements worldwide Lidcombe Program benchmark data. The median number of clinic visits to Stage 2 was 11. High pre-treatment stuttering severity predicted more clinic visits than low severity. A trend toward statistical significance was found for the frequency of clinic visits. Frequent attendance of mean less than 11 days was associated with longer treatment times than infrequent attendance of mean 11 days or more. Results for North America were consistent with benchmark data from the UK and Australia. The mean attendance trend is clinically important and requires further investigation because of its potential clinical significance.

Assessment of Reliable Change Using 95% Credible Intervals for the Differences in Proportions: A Statistical Analysis for Case-Study Methodology.

PURPOSE Case-study methodology studying change is often used in the field of speech-language pathology, but it can be criticized for not being statistically robust. Yet with the heterogeneous nature of many communication disorders, case studies allow clinicians and researchers to closely observe and report on change. Such information is valuable and can further inform large-scale experimental designs. In this research note, a statistical analysis for case-study data is outlined that employs a modification to the Reliable Change Index (Jacobson & Truax, 1991). The relationship between reliable change and clinical significance is discussed. Example data are used to guide the reader through the use and application of this analysis. METHOD A method of analysis is detailed that is suitable for assessing change in measures with binary categorical outcomes. The analysis is illustrated using data from one individual, measured before and after treatment for stuttering. CONCLUSIONS The application of this approach to assess change in categorical, binary data has potential application in speech-language pathology. It enables clinicians and researchers to analyze results from case studies for their statistical and clinical significance. This new method addresses a gap in the research design literature, that is, the lack of analysis methods for noncontinuous data (such as counts, rates, proportions of events) that may be used in case-study designs.

Clinicians’ management of young children with co-occurring stuttering and speech sound disorder

Abstract Speech sound disorders reportedly co-occur in young children who stutter at a substantial rate. Despite this, there is a paucity of scientific research available to support a treatment approach when these disorders co-exist. Similarly, little is known about how clinicians are currently working with this caseload given that best practice for the treatment of both disorders in isolation has evolved in recent years. This study used a qualitative approach to explore current clinical management and rationales when working with children who have co-occurring stuttering and speech sound disorder. Thirteen participant SLPs engaged in semi-structured telephone interviews. Interview data were analysed based on principles derived from grounded theory. Several themes were identified including multi-faceted assessment, workplace challenges, weighing-up the evidence, and direct intervention. The core theme, clinical reasoning, highlighted the participants’ main concern, that not enough is known about this caseload on which to base decisions about intervention. There was consensus that little is available in the research literature to guide decisions relating to service delivery. These findings highlight the need for further research to provide evidence-based guidelines for clinical practice with this caseload.

The reliability of a severity rating scale to measure stuttering in an unfamiliar language

Abstract With increasing multiculturalism, speech-language pathologists (SLPs) are likely to work with stuttering clients from linguistic backgrounds that differ from their own. No research to date has estimated SLPs’ reliability when measuring severity of stuttering in an unfamiliar language. Therefore, this study was undertaken to estimate the reliability of SLPs’ use of a 9-point severity rating (SR) scale, to measure severity of stuttering in a language that was different from their own. Twenty-six Australian SLPs rated 20 speech samples (10 Australian English [AE] and 10 Mandarin) of adults who stutter using a 9-point SR scale on two separate occasions. Judges showed poor agreement when using the scale to measure stuttering in Mandarin samples. Results also indicated that 50% of individual judges were unable to reliably measure the severity of stuttering in AE. The results highlight the need for (a) SLPs to develop intra- and inter-judge agreement when using the 9-point SR scale to measure severity of stuttering in their native language (in this case AE) and in unfamiliar languages; and (b) research into the development and evaluation of practice and/or training packages to assist SLPs to do so.

Control of chronic stuttering with self-imposed time-out: preliminary outcome data

Abstract Many laboratory studies and case studies suggest that the operant technique of timeout may have clinical potential in reducing or eliminating stuttering. This paper describes the development of a treatment programme for adults who stutter that incorporates self-imposed time-out (SITO). Preliminary data are presented for one client. The clients stuttering reached near-zero levels, both within and beyond the clinic, following six clinical hours of the SITO treatment. These results were maintained for six months.

Evidence for the treatment of co-occurring stuttering and speech sound disorder: A clinical case series

Abstract Purpose: There is a paucity of evidence to guide treatment for children with co-occurring stuttering and speech sound disorder. Some guidelines suggest treating the two disorders simultaneously using indirect treatment approaches; however, the research supporting these recommendations is over 20 years old. In this clinical case series, we investigate whether these co-occurring disorders could be treated concurrently using direct treatment approaches supported by up-to-date, high-level evidence, and whether this could be done in an efficacious, safe and efficient manner. Method: Five pre-school-aged participants received individual concurrent, direct intervention for both stuttering and speech sound disorder. All participants used the Lidcombe Program, as manualised. Direct treatment for speech sound disorder was individualised based on analysis of each child’s sound system. Result: At 12 months post commencement of treatment, all except one participant had completed the Lidcombe Program, and were less than 1.0% syllables stuttered on samples gathered within and beyond the clinic. These four participants completed Stage 1 of the Lidcombe Program in between 14 and 22 clinic visits, consistent with current benchmark data for this programme. At the same assessment point, all five participants exhibited significant increases in percentage of consonants correct and were in alignment with age-expected estimates of this measure. Further, they were treated in an average number of clinic visits that compares favourably with other research on treatment for speech sound disorder. Conclusion: These preliminary results indicate that young children with co-occurring stuttering and speech sound disorder may be treated concurrently using direct treatment approaches. This method of service delivery may have implications for cost and time efficiency and may also address the crucial need for early intervention in both disorders. These positive findings highlight the need for further research in the area and contribute to the limited evidence base.

The reliability of Vietnamese speech therapists’ use of a severity rating scale to measure stuttering

ABSTRACT Speech therapy is an emerging profession in Vietnam, and there is an estimated 910 000 Vietnamese people who stutter. No research to date has examined Vietnamese speech therapists’ reliability when measuring severity of stuttering in their native language (Vietnamese) and other languages (e.g. English, a common second language). Twenty-five Vietnamese speech therapists rated 20 speech samples (10 Vietnamese, 10 English) of adults who stutter using a 9-point severity rating (SR) scale on two occasions. Approximately half of the judges were able to measure severity of stuttering reliably in Vietnamese. Judges’ performance in English was poorer than in their native language. Irrespective of language, judges showed greater variability of their use of the scale in the moderate range. Results highlight the need for judges to develop intra- and interjudge agreement when using the scale to measure stuttering in their native and other languages. Research into the development and evaluation of practice and/or training packages would be beneficial to this population, in all languages, with a focus in the moderate range of the scale.