Impact of Evidence-Based Language Interventions on Teenagers

What is the impact of evidence-based language interventions on academic performance and social communication skills in teenagers with language disorders?

Language interventions yield substantial improvements

Language interventions yield substantial improvements in both academic performance and social communication among teenagers with language disorders, with particularly strong effects in word-finding (d = 2.5) and social abilities (d = 1.36).

Abstract

Evidence-based language interventions improve both academic performance and social communication among teenagers with language disorders. Semantic approaches that target word-finding report large gains (d = 2.5), while direct one‐to‐one speech therapy and explicit vocabulary training yield medium effect sizes (d = 1.06 and d = 1.07, respectively). Classroom-based narrative and reading comprehension programs also show positive outcomes, with narrative skills improving (d = 0.296) and reading interventions noted for producing large qualitative effects.

Studies assessing social communication report a 10.5–point gain on standardized measures over 8 weeks and an improvement in social abilities with an effect size of d = 1.36. Interventions delivered via individual sessions, group classroom settings, technology-enhanced formats, and teacher-mediated strategies demonstrate that tailoring the method to target specific language and communication skills can enhance both academic and social outcomes for teenagers with language disorders.

Methods

We analyzed 25 sources from an initial pool of 500, using 8 screening criteria. Each paper was reviewed for 6 key aspects that mattered most to the research question.

Papers identified with Elicit search

• n = 500
• Papers screened out: n = 475
• Papers included for extraction: n = 25

Data extraction

We asked a large language model to extract each data column below from each paper, focusing on key aspects relevant to the research question:

Study Design Type

• Quasi-experimental intervention study
• Randomized controlled trial

Randomization Details

• Unit of randomization: Individual students
• Method of randomization: Computer-generated sequence

Participant Demographics

• Total number of participants: 72
• Age range: 9-17 years; mean age 13 years and 4 months
• Gender distribution: Male: 52 (72%), Female: 20 (28%)

Intervention Characteristics

• Intervention name/type: Direct 1:1 speech and language therapy (SLT)
• Delivery method: Individual

Primary Outcome Measures

• Significant improvement in targeted areas compared to controls (d = 1.06, p < 0.001).

Key Intervention Outcomes

• Changes in academic performance: Significant improvement in targeted areas (d = 1.06)

Results

Characteristics of Included Studies

Of the studies included in this review, quasi-experimental designs were most common, followed by systematic reviews and randomized controlled trials. The interventions primarily focused on students, adolescents, and included participants with various language disorders.

Effects of Language Interventions

Academic Performance Outcomes

The most common academic domain targeted was vocabulary knowledge. Effect sizes varied across studies, with some reporting large and medium effects.

Social Communication Outcomes

Communication skills were primarily assessed with significant improvements reported for both general and specific social abilities.

Implementation Factors

Delivery Methods

The studies included various delivery methods:

• Individual sessions
• Classroom-based interventions
• Technology-based delivery

Duration and Intensity

The duration and intensity of interventions also varied, with some showing significant immediate effects even in short interventions.

Context Considerations

Several contextual factors emerged including age range, type of language disorder, and educational setting that influenced interventions' effectiveness.

Conclusions and Implications for Clinical Practice

Direct 1:1 intervention with an SLT can be effective across all areas of language for older children and adolescents with Developmental Language Disorder (DLD). This emphasizes the need for available direct SLT services for this demographic.