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

The Lidcombe Program for Early Stuttering in Non-English-Speaking Countries: A Systematic Review

BACKGROUND

The Lidcombe Program is a stuttering treatment approach for children between the ages of 3 and 6 years. Most papers about the Lidcombe Program, however, are based on studies conducted in native English-speaking countries. The aim of this paper is to systematically review the delivery and implementation of the Lidcombe Program in non-native English-speaking countries.

SUMMARY

A resource search was conducted between October and November 2019. Scopus, PubMed, ASHA, Cochrane Library, ERIC, Google Scholar, and SpeechBITE databases and reference lists of relevant papers were searched for the identification process. Joanna Briggs Institute tools were used for the appraisal of the studies. The search yielded 8 studies conducted in non-native English-speaking countries. The Lidcombe Program is efficacious in non-native English-speaking countries when delivered to both preschool and young school age children who stutter. It is reported to be delivered with minor changes and challenges. The number of weekly clinic visits and the total time needed to reach zero or near-zero stuttering levels with the Lidcombe Program can be up to 3 times greater in non-native English-speaking countries than in native English-speaking countries, mostly due to the increased time needed to introduce the parental verbal contingencies. Key Messages: Speech and language therapists practicing in non-native English-speaking countries are encouraged to use the Lidcombe Program for both preschool and young school age children who stutter, although this can take more time than that reported in native English-speaking countries. Further investigation to explore the therapy process with children and parents in non-native English-speaking countries is needed.

Predictors of Lidcombe Program treatment dropout and outcome for early stuttering

BACKGROUND

Information is available about what predicts Lidcombe Program treatment time, but nothing is known about what predicts treatment prognosis.

AIMS

To investigate the predictors of treatment dropout and treatment outcome for children who were treated for early stuttering with the Lidcombe Program (N = 277).

METHODS & PROCEDURES

A total of 32 variables were used as predictors in regression analyses of short- and medium-term Lidcombe Program outcome, and of treatment dropout.

OUTCOMES & RESULTS

Regression analyses associated children who have better language skills and easy temperament with better treatment outcome, although only a small portion of the variance of treatment outcome was accounted for by these variables. There was an association between treatment dropout and parental scores on a personality screening tool relating to their impulsivity.

CONCLUSIONS & IMPLICATIONS

Variables identified as predictors of Lidcombe Program treatment outcome were statistically significant, but not clinically significant. They did not account for a clinically substantive portion of treatment outcomes. Findings about parental impulsivity and their relationship with intervention drop-out require replication with prospective methods and comprehensive assessment of parent psychological status. This is particularly important because parents are involved in conducting all early interventions. What this paper adds What is already known on the subject Information is available about what predicts Lidcombe Program treatment time, but nothing is known about what predicts Lidcombe Program treatment outcome. What this paper adds to existing knowledge There are predictors of Lidcombe Program treatment outcome that are statistically significant, but none are clinically significant. What are the potential or actual clinical implications of this work? Clinicians can tell parents that nothing has been found that can assist with making prognostic indications about treatment outcome for their children.

Verbal Contingencies in the Lidcombe Program: A Noninferiority Trial

Purpose The Lidcombe Program is an efficacious and effective intervention for early stuttering. The treatment is based on parent verbal response contingent stimulation procedures, which are assumed to be responsible for treatment effect. The present trial tested this assumption. Method The design was a parallel, open plan, noninferiority randomized controlled trial. In the experimental arm, the five Lidcombe Program verbal contingencies were removed from parent instruction. The primary outcome was beyond-clinic percentage syllables stuttered at 18-month follow-up. Seventy-four children and their parents were randomized to one of the two treatment arms. Results Findings of noninferiority were inconclusive for the primary outcome of stuttering severity, based on a margin of 1.0 percentage syllables stuttered. Conclusions The inconclusive finding of noninferiority means it is possible that verbal contingencies make some contribution to the Lidcombe Program treatment effect. However, considering all primary and secondary outcomes, an overriding impression from the trial is a similarity of outcomes between the control and experimental arms. The clinical applications of the trial are discussed, along with further research that is needed.

Three Lidcombe program clinic visit options: a phase II trial

PURPOSE

Weekly clinic visits are recommended in the Lidcombe Program Treatment Guide (Packman et al., 2015). That specification is based on traditional speech-language pathology practices rather than empirical research, and two studies have suggested that such a format does not always occur in clinical communities. This research was conducted to determine the relative efficacy of different Lidcombe Program models of clinic visits.

METHOD

Thirty-one children were randomized to three different service delivery models: twice-weekly, weekly and fortnightly (once every two weeks) clinic visits. All children were treated with the Lidcombe Program following manualised procedures. Measures of percentage syllables stuttered were obtained from beyond clinic audio recordings pre- and post-randomization.

RESULTS

Results showed that the twice-weekly and fortnightly treatment formats were not suitable for all families. However, the fortnightly outcomes at 9 months post-randomization were comparable with those attained during weekly clinic visits.

CONCLUSIONS

These results justify further, large-scale clinical trialling to compare weekly Lidcombe Program clinic visits with schedules involving less frequent clinic visits.

Case file audit of Lidcombe program outcomes in a student-led stuttering clinic

PURPOSE

The current study aimed to benchmark clinical outcomes for preschool-aged clients (2;0-5;11 years old) that attended a student-led clinic and undertook the Lidcombe Program.

METHOD

A case file audit was undertaken for all preschool clients who attended the clinic between February 2008 and February 2013 and commenced the Lidcombe Program. Clients were grouped according to Stage 1 completion. A mixed ANOVA was used to test for differences between the groups in initial and final percentage syllables stuttered (%SS). Associations between case variable factors and treatment duration were investigated using Pearson correlations.

RESULT

Clients who completed Stage 1 had final %SS and severity rating (SR) scores comparable to the literature; however, the median Stage 1 duration was greater. Over half of the clients (57%) withdrew prior to completing Stage 1. These clients had a significantly higher %SS at final treatment session than their completing peers. Initial %SS and SR scores were the only case variables associated with treatment duration.

CONCLUSION

Students can achieve the same short-term treatment outcomes for children who stutter using the Lidcombe Program as the current published literature; however, treatment duration is greater and may impact completion. Implications of this for clinical education are discussed.

Lidcombe Program Webcam Treatment for Early Stuttering: A Randomized Controlled Trial

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 stuttering.

METHOD

The design was a parallel, open plan, noninferiority randomized controlled trial of the standard Lidcombe Program treatment and the experimental webcam Lidcombe Program treatment. Participants were 49 children aged 3 years 0 months to 5 years 11 months at the start of treatment. Primary outcomes were the percentage of syllables stuttered at 9 months postrandomization and the number of consultations to complete Stage 1 of the Lidcombe Program.

RESULTS

There was insufficient evidence of a posttreatment difference of the percentage of syllables stuttered between the standard and webcam Lidcombe Program treatments. There was insufficient evidence of a difference between the groups for typical stuttering severity measured by parents or the reported clinical relationship with the treating speech-language pathologist.

CONCLUSIONS

This trial confirmed the viability of the webcam Lidcombe Program intervention. It appears to be as efficacious and economically viable as the standard, clinic Lidcombe Program treatment.

The Lidcombe Program of early stuttering intervention for Malaysian families: Four case studies

PURPOSE

This study investigated the outcomes of implementing the Lidcombe Program, an evidence-based early intervention for stuttering, with four preschool children in Malaysia. Early stuttering intervention is currently underdeveloped in Malaysia, where stuttering treatment is often more assertion-based than evidence-based. Therefore, introducing an evidence-based early stuttering intervention is an important milestone for Malaysian preschoolers who stutter.

METHOD

The participants ranged from 3 years 3 months to 4 years 9 months at the start of the study. Beyond-clinic speech samples were obtained at 1 month and 1 week pretreatment and immediately post-Stage 1, and at 1 month, 3 months, 6 months and 12 months post-Stage 1.

RESULTS

Two participants, who were bilingual, achieved near-zero levels of stuttering at 12 months posttreatment. Near zero levels of stuttering were also present in their untreated languages. One participant withdrew due to reasons not connected with the research or treatment. The remaining participant, who presented with severe stuttering, completed Stage 1 but had some relapse in Stage 2 and demonstrated mild stuttering 12 months post-Stage 1.

CONCLUSIONS

The outcomes were achieved without the need to significantly adapt Lidcombe Program procedures to Malaysian culture. Further research to continue evaluation of the Lidcombe Program with Malaysian families and to estimate proportion of those who will respond is warranted.

Non-pharmacological treatments for stuttering in children and adults: a systematic review and evaluation of clinical effectiveness, and exploration of barriers to successful outcomes

BACKGROUND

Despite many years of research, there is no certainty regarding the cause of stuttering. Although numerous interventions have been developed, a broad-based systematic review across all forms of intervention for adults and children was needed including views and perceptions of people who stutter.

OBJECTIVE

The aims of the study were to report the clinical effectiveness of interventions for people who stutter (or clutter), to examine evidence regarding the views of people who stutter and the views of professionals regarding interventions.

DATA SOURCES

A systematic review of quantitative and qualitative literature was carried out between August 2013 and April 2014. The following electronic databases were searched: (1) MEDLINE, (2) EMBASE, (3) The Cochrane Library (including The Cochrane Database of Systematic Reviews, Cochrane Central Register of Controlled Trials, Database of Abstracts of Reviews of Effects, Health Technology Assessment Database and NHS Economic Evaluations Database), (4) PsycINFO, (5) Science Citation Index, (6) Social Science Citation Index, (7) Cumulative Index to Nursing and Allied Health Literature, (8) ASSIA, (9) Linguistics and Language Behavior Abstracts, (10) Sociological Abstracts and (11) the EPPI Centre. Reference lists of included papers and other reviews were screened and also key journals in the subject area were hand-searched.

REVIEW METHODS

The searches aimed to identify (1) evidence of clinical effectiveness in populations of pre-school children, school-aged children, adolescents and adults, and (2) data relating to perceptions of barriers and facilitators to intervention clinical effectiveness among staff and people who stutter. A metasynthesis of the two linked elements via development of a conceptual model was also carried out to provide further interpretation of the review findings.

RESULTS

A systematic search of the literature identified a large number of potentially relevant studies. Of these, 111 studies examining the clinical effectiveness of interventions, 25 qualitative papers and one mixed-methods paper met the criteria for inclusion in this review. Review of the effectiveness literature indicated evidence of positive outcomes across all types of interventions. Virtually all evidence we identified reported at least some positive effect for some participants. However, there was evidence of considerable individual variation in outcome for study participants. The qualitative literature highlighted the need for programmes to be tailored to individual need with variation at the levels of the intervention, the individual and interpersonal/social elements. Metasynthesis of the data highlighted the complexity of elements that need to be considered in evaluation of long-term impacts following stuttering interventions.

LIMITATIONS

Around two-thirds of the studies were considered to be at higher risk of bias. The heterogeneous nature and variability in outcomes meant that we were unable to complete a meta-analysis.

CONCLUSIONS

Although much of the evidence we identified was from studies at risk of bias, it is suggested that most available interventions for stuttering may be of benefit to at least some people who stutter. There is a requirement for greater clarity regarding what the core outcomes following stuttering intervention should be and also enhanced understanding of the process whereby interventions effect change. Further analysis of those for whom interventions have not produced a significant benefit may provide additional insights into the complex intervention-outcomes pathway.

STUDY REGISTRATION

This study is registered as PROSPERO CRD42013004861.

Management options for pediatric patients who stutter: current challenges and future directions

Stuttering is a speech disorder, with onset often occurring in the preschool years. The prevalence of stuttering in young children is much higher than that in the general population, suggesting a high rate of recovery. However, we are unable to predict which children will recover without treatment, and it is widely acknowledged that stuttering therapy during childhood provides the best safeguard against chronic stuttering. This review reports on current evidence-based stuttering treatment options for preschoolers through to adolescents. We discuss the clinical challenges associated with treating pediatric clients who stutter at different stages of development and explore potential areas of treatment research that might serve to advance current clinical practice in the future.

Phase II trial of a syllable-timed speech treatment for school-age children who stutter

PURPOSE

A recent clinical trial (Andrews et al., 2012) showed Syllable Timed Speech (STS) to be a potentially useful treatment agent for the reduction of stuttering for school-age children. The present trial investigated a modified version of this program that incorporated parent verbal contingencies.

METHODS

Participants were 22 stuttering children aged 6-11 years. Treatment involved training the children and their parents to use STS in conversation. Parents were also taught to use verbal contingencies in response to their child's stuttered and stutter-free speech and to praise their child's use of STS. Outcome assessments were conducted pre-treatment, at the completion of Stage 1 of the program and 6 months and 12 months after Stage 1 completion.

RESULTS

Outcomes are reported for the 19 children who completed Stage 1 of the program. The group mean percent stuttering reduction was 77% from pre-treatment to 12 months post-treatment, and 82% with the two least responsive participants removed. There was considerable variation in response to the treatment. Eleven of the children showed reduced avoidance of speaking situations and 18 were more satisfied with their fluency post-treatment. However, there was some suggestion that stuttering control was not sufficient to fully eliminate situation avoidance for the children.

CONCLUSIONS

The results of this trial are sufficiently encouraging to warrant further clinical trials of the method.

Parent verbal contingencies during the Lidcombe Program: Observations and statistical modeling of the treatment process

PURPOSE

The purpose of this study was to document parent presentation of the Lidcombe Program verbal contingencies and model potential relationships between contingency provision and treatment duration.

METHODS

Forty parent-child pairs undertaking the Lidcombe Program participated, 26 of whom completed Stage 1. All participants were included in the analyses. Parents completed weekly audio-recordings of treatment during practice sessions and a diary of treatment during natural conversations. The number and types of contingencies provided during practice sessions were counted for 520 recordings. Accelerated failure time modeling was used to investigate associations between contingency provision during the first 4 weeks of treatment and duration of time to complete Stage 1.

RESULTS

During practice sessions 91% of contingencies were for stutter-free speech, 6.8% were for stuttering and 2.7% were incorrectly applied. Parents often combined several verbal contingencies into one. During natural conversations, the number of verbal contingencies reportedly provided across the day was low, an average of 8.5 (SD=7.82) contingencies for stutter-free speech and 1.7 (SD=2.43) for unambiguous stuttering. There was a positive, significant relationship between the number of verbal contingencies for stuttering provided during the first 4 weeks of treatment and time taken to complete Stage 1.

CONCLUSION

Parents mostly provided the expected types of contingencies but the number was lower than expected. An unexpected association was found between number of verbal contingencies for stuttering and treatment duration. Further research is required to explore the relation between rates of parent verbal contingencies, treatment process duration, and treatment outcome.

The state of the art in non-pharmacological interventions for developmental stuttering. Part 1: a systematic review of effectiveness

BACKGROUND

The growing range of available treatment options for people who stutter presents a challenge for clinicians, service managers and commissioners, who need to have access to the best available treatment evidence to guide them in providing the most appropriate interventions. While a number of reviews of interventions for specific populations or a specific type of intervention have been carried out, a broad-based systematic review across all forms of intervention for adults and children was needed to provide evidence to underpin future guidelines, inform the implementation of effective treatments and identify future research priorities.

AIMS

To identify and synthesize the published research evidence on the clinical effectiveness of the broad range of non-pharmacological interventions for the management of developmental stuttering.

METHODS & PROCEDURES

A systematic review of the literature reporting interventions for developmental stuttering was carried out between August 2013 and April 2014. Searches were not limited by language or location, but were restricted by date to studies published from 1990 onwards. Methods for the identification of relevant studies included electronic database searching, reference list checking, citation searching and hand searching of key journals. Appraisal of study quality was performed using a tool based on established criteria for considering risk of bias. Due to heterogeneity in intervention content and outcomes, a narrative synthesis was completed.

MAIN CONTRIBUTION

The review included all available types of intervention and found that most may be of benefit to at least some people who stutter. There was evidence, however, of considerable individual variation in response to these interventions. The review indicated that effects could be maintained following all types of interventions (although this was weakest with regard to feedback and technology interventions).

CONCLUSIONS

This review highlights a need for greater consensus with regard to the key outcomes used to evaluate stuttering interventions, and also a need for enhanced understanding of the process whereby interventions effect change. Further analysis of the variation in effectiveness for different individuals or groups is needed in order to identify who may benefit most from which intervention.

Predicting Treatment Time and Long-Term Outcome of the Lidcombe Program: A Replication and Reanalysis

PURPOSE

The present study presents treatment duration and outcome data on 14 children who stutter (CWS) recently treated by the Lidcombe Program (LP). These data were then combined with data from a previous LP treatment study (Miller & Guitar, 2009) to examine predictor variables for treatment duration and outcome. The present study also provides evidence of the effectiveness of LP from researchers who are independent of the developers of the program.

METHOD

Fourteen preschool CWS were assessed on stuttering severity variables and participant characteristics prior to treatment, given LP treatment, and reassessed 2 years after the children achieved stable fluency. These children's data were added to the data of 15 previously treated CWS to examine predictors of treatment duration and long-term outcome. Preliminary analysis lead to the identification of two predictors that were tested in a generalized linear model.

RESULTS

For the new group of 14 CWS, median treatment duration was 15 clinic visits and resulted in near-zero stuttering long term for most of the children and substantial reductions in stuttering for all of the children. For the combined group of 29 children, pretreatment stuttering frequency and severity were the best predictors of treatment duration in both clinic visits and weeks.

CONCLUSIONS

Children with more frequent and more severe stuttering may take longer in LP treatment. Long-term outcome may best be predicted by pretreatment stuttering and sex.

An investigation of the role of parental request for self-correction of stuttering in the Lidcombe Program

PURPOSE

The Lidcombe Program is a behavioural treatment for stuttering in children younger than 6 years that is supported by evidence of efficacy and effectiveness. The treatment incorporates parent verbal contingencies for stutter-free speech and for stuttering. However, the contribution of those contingencies to reductions in stuttering in the program is unclear.

METHOD

Thirty-four parent-child dyads were randomized to two treatment groups. The control group received standard Lidcombe Program and the experimental group received Lidcombe Program without instruction to parents to use the verbal contingency request for self-correction. Treatment responsiveness was measured as time to 50% stuttering severity reduction.

RESULT

No differences were found between groups on primary outcome measures of the number of weeks and clinic visits to 50% reduction in stuttering severity.

CONCLUSION

This clinical experiment challenges the assumption that the verbal contingency request for self-correction contributes to treatment efficacy. Results suggest the need for further research to explore this issue.

Webcam delivery of the Lidcombe program for early stuttering: a phase I clinical trial

PURPOSE

The Lidcombe Program is an operant treatment for early stuttering shown with meta-analysis to have a favorable odds ratio. However, many clients are unable to access the treatment because of distance and lifestyle factors. In this Phase I trial, we explored the potential efficacy, practicality, and viability of an Internet webcam Lidcombe Program service delivery model.

METHOD

Participants were 3 preschool children who stuttered and their parents, all of whom received assessment and treatment using webcam in their homes with no clinic attendance.

RESULTS

At 6 months post-Stage 1 completion, all children were stuttering below 1.0% syllables stuttered. The webcam intervention was acceptable to the parents and appeared to be practical and viable, with only occasional audiovisual problems. At present, there is no reason to doubt that a webcam-delivered Lidcombe Program will be shown with clinical trials to have comparable efficacy with the clinic version.

CONCLUSION

Webcam-delivered Lidcombe Program intervention is potentially efficacious, is practical and viable, and requires further exploration with comparative clinical trials and a qualitative study of parent and caregiver experiences.

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

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.

Optimal intervention intensity

Empirical evidence exists for many of the different interventions in speech-language pathology. However, relatively little is known about the optimal intensity of those interventions. In order for speech-language pathology services to be both effective and efficient speech-language pathologists need to know how to faithfully administer ideal doses of the active ingredients of interventions, in what forms, how often and for how long. This is the lead paper to a scientific forum on this fundamental yet under-studied issue of clinical practice. Borrowing from the work of Warren, Fey, and Yoder, the concept of intervention intensity is described. Issues involved in establishing the optimal intensity of interventions are identified, including what and how intervention goals are targeted. Given that speech-language pathology interventions can involve the delivery of therapeutic inputs (e.g., conversational recasts, questions) and/or clients carrying out an act (e.g., speech production, voice production, comprehending, naming, swallowing), a framework is proposed for measuring all potential inputs and acts that might contribute to the calculation of an intervention intensity. Client-, clinician-, condition-, and service-related variables that could influence the investigation and practical application of an optimal intervention intensity are also discussed.