PriMera Scientific Surgical Research and Practice (ISSN: 2836-0028)

Research Article

Volume 6 Issue 1

Comparative Adaptive-Behavior Outcomes in Autism: A Meta-Analytic Synthesis Versus a Multicultural Vineland-3 Clinical Cohort

Henry A Montero*

June 30, 2025

Abstract

The present article provides practical insights for clinicians and researchers in autism intervention. It juxtaposes (i) the most significant recent meta-analyses of adaptive-behavior interventions in autism with (ii) a retrospective Vineland-3 study of 16 linguistically diverse autistic clients. This comparison clarifies where intervention effect sizes map into real-world clinical deficits, offering actionable recommendations for intervention strategies.

Methods. Systematic reviews published 2021-2025 that provided standardized mean changes on Communication, Socialization, Daily-Living Skills (DLS) or composite outcomes were extracted and compared with domain-level scores from the multicultural cohort (ages one y 10 m–27 y).

Results. Meta-analytic motor-based interventions yielded moderate benefits for combined social/communication outcomes (Hedges g = 0.47) but diminished by 0.29 SD for each year above age nine y. In our cohort, Communication averaged 54 (≥1.5 SD below mean) and declined 4 points per chronological year (ρ = -.71, p = .003). DLS presented as a relative strength (M = 63) yet remained 2.5 SD sub-normative. Socialization mirrored the meta-analytic gain trajectory (g = 0.46) but again lagged 43 points below population norms. Intelligence moderated adaptive gaps in the literature and our sample (FSIQ β = 0.25–0.38 for Global Adaptive Composite).

Conclusions. Meta-analytic effect sizes are clinically meaningful only when delivered at ≥20 h/week before age 9. Expressive-language weakness and widening age-related gaps in multicultural settings require integrated Naturalistic Developmental Behavioural Interventions with augmentative-communication components, plus sustained DLS coaching across development.

Keywords: autism spectrum disorder; adaptive behavior; meta-analysis; Vineland-3; multicultural

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