The effectiveness of parent-implemented language interventions: a meta-analysis

Why the study was done

Parents spend far more time with their child than any therapist can. Parent-implemented interventions teach parents specific ways to support language during everyday play and routines. The authors wanted to know how well this approach works across the research.

What the researchers did

A systematic search found 18 studies that met the review's criteria. All involved children aged about 18 months to 5 years with language delays or impairments, including children with and without intellectual disabilities. The authors calculated effect sizes for seven language outcomes and compared results by group, by type of comparison, and by how language was measured (parent report or direct observation).

What they found

• Parent-implemented interventions had a significant, positive effect on both receptive language (understanding) and expressive language (talking).
• The benefit held for children with and without intellectual disabilities.
• Effect sizes varied by outcome and comparison group, from small to large.

What this means for families

The time you spend with your child between sessions counts. When parents learn and use the same strategies the therapist uses, children's language grows. Our parent coaching is built on this: every session ends with practical things to try at home, during meals, bath time, and play.

Limits of the study

Results varied across measures and comparison groups, and the studies differed in how they were run. The summary here is based on the published abstract; the full paper discusses which features of parent training mattered most.