The influence of quantitative intervention dosage on oral language outcomes for children with developmental language disorder: a systematic review and narrative synthesis

dc.contributor.authorFrizelle, Pauline
dc.contributor.authorTolonen, Anna-Kaisa
dc.contributor.authorTulip, Josie
dc.contributor.authorMurphy, Carol-Anne
dc.contributor.authorSaldana, David
dc.contributor.authorMcKean, Cristina
dc.contributor.funderEuropean Cooperation in Science and Technologyen
dc.contributor.funderNational Health and Medical Research Councilen
dc.date.accessioned2021-05-24T11:35:35Z
dc.date.available2021-05-24T11:35:35Z
dc.date.issued2021-01-19
dc.date.updated2021-05-21T10:41:11Z
dc.description.abstractPurpose: The aim of this study was to examine the degree to which quantitative aspects of dosage (dose, dose frequency, and total intervention duration) have been examined in intervention studies for children with developmental language disorder (DLD). Additionally, to establish the optimal quantitative dosage characteristics for phonology, vocabulary, and morphosyntax outcomes. Method: This registered review (PROSPERO ID CRD42017076663) adhered to PRISMA guidelines. Search terms were included in seven electronic databases. We included peer-reviewed quasi-experimental, randomized controlled trial or cohort analytical studies, published in any language between January 2006 and May 2020. Included articles reported on participants with DLD (M = 3–18 years); oral language interventions with phonology, vocabulary, or morphosyntax outcomes; and experimental manipulation or statistical analysis of any quantitative aspect of dosage. Studies were appraised using the Cochrane risk-of-bias tool. Results: Two hundred forty-four articles reported on oral language interventions with children with DLD in the domains of interest; 13 focused on experimentally/statistically manipulating quantitative aspects of dosage. No article reported phonological outcomes, three reported vocabulary, and eight reported morphosyntax. Dose frequency was the most common characteristic manipulated. Conclusions: Research is in its infancy, and significant further research is required to inform speech-language pathologists in practice. Dosage characteristics are rarely adequately controlled for their individual effects to be identified. Findings to date suggest that there is a point in vocabulary and morphosyntax interventions after which there are diminishing returns from additional dosage. If dose is high (number of learning opportunities within a session), then the literature suggests that session frequency can be reduced. Frequent, short sessions (2/3 × per week, approximately 2 min) and less frequent, long sessions (1 × per week, approximately 20 min) have yielded the best outcomes when composite language measures have been used; however, replication and further research are required before clinicians can confidently integrate these findings into clinical practice.en
dc.description.sponsorshipEuropean Cooperation in Science and Technology (Grant: COST 106/14)en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationFrizelle, P., Tolonen, A.-K., Tulip, J., Murphy, C.-A., Saldana, D. and McKean, C. (2021) 'The Influence of Quantitative Intervention Dosage on Oral Language Outcomes for Children With Developmental Language Disorder: A Systematic Review and Narrative Synthesis', Language, Speech, and Hearing Services in Schools, 52(2), pp. 738-754. doi: 10.1044/2020_LSHSS-20-00058en
dc.identifier.doi10.1044/2020_LSHSS-20-00058en
dc.identifier.endpage754en
dc.identifier.issn1558-9129
dc.identifier.issued2en
dc.identifier.journaltitleLanguage, Speech, And Hearing Services In Schoolsen
dc.identifier.startpage738en
dc.identifier.urihttps://hdl.handle.net/10468/11375
dc.identifier.volume52en
dc.language.isoenen
dc.publisherAmerican Speech-Language-Hearing Associationen
dc.relation.projectinfo:eu-repo/grantAgreement/NHMRC/Centres of Research Excellence/1023493/AU/Centre for Research Excellence in Childhood Language/en
dc.relation.urihttps://pubs.asha.org/doi/10.1044/2020_LSHSS-20-00058
dc.rights© 2021 American Speech-Language-Hearing Association. This is the authors' accepted manuscript of an article that has been published in its final definitive form in Language, Speech, And Hearing Services In Schools, https://doi.org/10.1044/2020_LSHSS-20-00058en
dc.subjectDoseen
dc.subjectDosageen
dc.subjectInterventionen
dc.subjectIntensityen
dc.subjectDLDen
dc.titleThe influence of quantitative intervention dosage on oral language outcomes for children with developmental language disorder: a systematic review and narrative synthesisen
dc.typeArticle (peer-reviewed)en
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