Elicit: Comparative Effectiveness of Early Childhood Interventions (public)

Comparative Effectiveness of Early Childhood Interventions (public)

What are the comparative effect sizes of early childhood educational interventions across different age groups and learning domains?

Early childhood educational interventions demonstrate varying effectiveness across domains, producing effect sizes of 0.10-1.45 standard deviations for cognitive outcomes, 0.18-1.22 for mathematics, 0.10-0.44 for language (up to 1.10 for literacy), and 0.19-0.56 for socioemotional and motor development, with comparable benefits observed across preschool and infant age groups.

Abstract

Early childhood educational interventions yield effect sizes that vary by learning domain, intervention modality, and age group. Studies targeting cognitive outcomes report gains ranging from 0.10 to 1.45 standard deviations—with intensive, multi-year programs (e.g., Ramey and Ramey, 2023) achieving the largest benefits—while language-focused programs generally produce improvements of 0.10 to 0.44 standard deviations, with some literacy interventions reaching 1.10. Mathematics interventions typically exhibit effects from 0.18 to 1.22 standard deviations, especially when curriculum-based and structured (as in Yıldız et al., 2025 and Clements et al., 2011). Socioemotional and motor development interventions tend to yield modest gains (approximately 0.19–0.56), a range further supported by evaluations of responsive caregiving and physical activity programs. Most studies concentrate on preschool-aged children, though interventions for infants show comparable benefits. Greater intervention intensity, duration, and multi-component design are associated with larger effects, according to the reported findings.

Methods

We analyzed 40 sources from an initial pool of 997, 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 = 997
Papers screened out
n = 957

Papers included for extraction

n = 40

Results

Characteristics of Included Studies

Study	Intervention Type	Age Group	Learning Domain	Study Design
Love et al., 2013	Direct coaching, video modeling, self-reflection, resource/referral services	Prenatal to 5 years	Cognitive, language, attention, behavior, health, parenting, mental health, employment	Randomized controlled trial (RCT), Longitudinal, Comparative
Meghir et al., 2023	Early stimulation (home-based), enhanced preschool (center-based)	7-16 months to ~4 years	Cognition, language, executive function, school readiness	Randomized controlled trial (RCT), Longitudinal
Olive et al., 2023	Physical activity intervention (AEL)	3-5 years	Executive function, expressive vocabulary, motor skills	Randomized controlled trial (RCT)
Camilli et al., 2010	Direct instruction, inquiry-based, teacher/small-group	Pre-Kindergarten	Cognitive, social, school progress	Comparative, Quasi-experimental, Randomized controlled trial (RCT)
Campbell et al., 2001	Full-time, high-quality educational child care	Infancy to 21 years	Cognitive, academic (reading, math)	Randomized controlled trial (RCT), Longitudinal
Reynolds et al., 2001	Comprehensive education, family, health services	3-9 years, followed to 20	Academic, social, educational attainment, crime	Longitudinal, Quasi-experimental, Comparative

Effects

Effect Sizes by Age Group

Study	Age Group	Learning Domain	Effect Size Range	Number of Studies
Love et al., 2013	1-5 years	Cognitive, language, socioemotional	0.10–0.20 (cognitive/language), 0.31–0.38 (engagement)	1
Meghir et al., 2023	7-48 months	IQ, school readiness	0.13–0.24 standard deviations	1
Olive et al., 2023	3-5 years	Executive function, vocabulary	Cohen’s d=0.24–0.29	1

Geographical and Contextual Factors

Country or region of study: Various countries, including low-, middle-, and high-income settings.
Income level classification: Low-income, middle-income, high-income.