# 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...

## Abstract

Early childhood educational interventions yield effect sizes that vary by learning domain, intervention modality, and age group. Studies targeting cognitive outcomes report gains...

## 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. More on methods

## Screening

We screened in sources based on their abstracts that met these criteria:

- **Population Age Range**: Does the study focus on children aged 0-8 years (early childhood period)?  
- **Quantitative Data Availability**: Does the study report quantitative effect sizes or provide sufficient quantitative data to calculate effect sizes?  
- **Study Design Rigor**: Is the study a randomized controlled trial, quasi-experimental study, or controlled study with comparison groups?  
- **Educational Setting**: Is the intervention implemented in early childhood educational settings (e.g., preschools, kindergartens, childcare centers, or home-based educational programs)?  
- **Learning Domain Focus**: Does the intervention target specific learning domains (cognitive, language, literacy, numeracy, social-emotional, or motor skill development)?  
- **Typical Development Population**: Does the study include typically developing children (rather than focusing solely on children with diagnosed developmental disabilities or special needs)?  
- **Intervention Component**: Does the study include an intervention component (rather than being purely observational)?  
- **Educational vs. Medical Focus**: Is the intervention primarily educational in nature (rather than primarily focused on medical or therapeutic treatments)?

## Data extraction

We asked a large language model to extract each data column below from each paper. We gave the model the extraction instructions shown below for each column.

- **Study Design Type**: Identify the specific type of study design used. Look in the methods section for precise description. Categorize as:

- Randomized Controlled Trial (RCT)
  - Quasi-experimental study
  - Comparative study
  - Longitudinal study

- **Intervention Type and Components**: Comprehensively list all components of the educational intervention...

- **Participant Demographics**: Extract the following participant details:

- **Age range of children**
- **Socioeconomic status (if reported)**
- **Risk factors or special circumstances**
- **Total sample size**
- **Gender distribution (if reported)**

- **Outcome Domains and Measurement**: List all primary outcome domains measured:

- Cognitive development
- Language development
- Motor development
- Socioemotional development
- Academic achievement
- Other specific domains

- **Long-term Outcomes**: Identify and extract any long-term outcomes measured...

- **Geographical and Contextual Factors**: Extract:

## Results

### Characteristics of Included Studies

| Study                          | Intervention Type                                   | Age Group       | Learning Domain                                            | Study Design                               | Full text retrieved |
|--------------------------------|-----------------------------------------------------|------------------|----------------------------------------------------------|--------------------------------------------|---------------------|
| Love et al., 2013              | Direct coaching, video modeling...                   | Prenatal to 5 years  | Cognitive, language...                                    | Randomized controlled trial (RCT)...       | Yes                 |
| Meghir et al., 2023          | Early stimulation (home-based)...                   | 7-16 months to ~4 years| Cognition, language...                                   | Randomized controlled trial (RCT)...       | No                  |
| Olive et al., 2023           | Physical activity intervention (AEL)                  | 3-5 years         | Executive function...                                    | Randomized controlled trial (RCT)...       | Yes                 |
| Camilli et al., 2010         | Direct instruction...                               | Pre-Kindergarten    | Cognitive, social...                                    | Identify all types...                     | No                  |  
| Reynolds et al., 2001        | Comprehensive education...                           | 3-9 years, followed to 20| Academic, social...                                     | Quasi-experimental...                     | Yes                 |

### 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...        | 0.10–0.20 (cognitive/language)...                | 1                  |  
| Olive et al., 2023           | 3-5 years           | Executive function...        | Cohen’s d=0.24–0.29...                          | 1                  |  
| Reynolds et al., 2001        | 3-20 years          | Educational, social...      | 11.2% increase in high school...                  | 1                  |

### Methodological Factors Influencing Effect Sizes

- Study Design: In the included studies, randomized controlled trials and large-scale longitudinal studies tended to report more robust and reliable effect sizes...

### Generalizability and Study Context

- Geographical Diversity: The included studies spanned high-, middle-, and low-income countries...

### Limitations:

- Heterogeneity in intervention types, outcome measures, and reporting limited direct comparison across studies...

## References

1. [Gregory Camilli, et al. (2010)](/content/review/aa875c3c-e214-410d-97e0-b56351d5ceda/source/51672164abb943fb89c61c1263e0d39b/index.html)
2. [F. Campbell, et al. (2001)](/content/review/aa875c3c-e214-410d-97e0-b56351d5ceda/source/27c22e890b4d45c09a33379ac18e0574/index.html)