Efficacy of very early interventions on neurodevelopmental outcomes for infants and toddlers at increased likelihood of or diagnosed with autism: A systematic review and meta-analysis.

Subgroup analyses were performed by age at enrolment, age at outcome assessment and by autism likelihood status however numbers of studies contributing to each subgroup were small and standardized mean differences did not reach statistical significance.

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The moderate effect size for change in gap‐effect in the Gap‐Overlap task, as hypothesized, was very close to statistical significance.

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