The Causal Effect of Parent-Child Interactions on Child Language Development at 3 and 4 Years.
Mary E Brushe, Murthy N Mittinty, Tess Gregory and 5 others
PMID 40323171WHAT IT FOUND
Higher daily back-and-forth parent-child talk was associated with higher child language scores at 36 and 48 months.
The modelled differences were small.
Key findings
01At 36 months, the estimated CELF-P2 language score was 108.51 if all children had parent-child conversational turns at the 95th percentile, and 100.42 if they had turns at the 5th percentile.
02At 48 months, the estimated CELF-P2 language score was 111.41 at the 95th percentile, and 97.21 at the 5th percentile.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The study was observational, not randomised, so the causal estimates depend on model assumptions and unmeasured confounding may remain. Over half of the participating families had missing data on at least one variable, and the reported estimates used an imputed sample of 296 families. The sample was restricted to English-speaking families with typically developing children, so it does not speak to children with diagnosed language impairment or dual-language learners. The outcome was the CELF-P2, a test designed to detect language impairment, and the authors note it may not be sensitive enough to capture subtle population-level changes. The exposure measured only the number of conversational turns, not the quality, complexity, or diversity of parent-child talk. Some home visits became remote or postal during COVID-19 lockdowns, which may have affected data collection. Recruiting the lower-educated group was difficult, and continued recruitment after Wave 1 may affect comparability.
Declared interests
The authors declared no conflicts of interest.
The easy way to misread this
Do not read the modelled score differences as proof that increasing parent-child talk will improve a child's language. The study used observational data and hypothetical population scenarios, and the authors report small effects.