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The problem
Intervention: Full-time preschool or parenting program for 3-4 year-old children
Who it was tested with: Children ages 3-4 years old.
Children or communities are compared with a group that did not receive the intervention, or followed over years. This is the design that best separates what the intervention did from everything else that changed.
"We compare children who, at 3-4 years old, were randomized into either a full-time preschool, a parenting program, or a control group. We returned to the children when they reached 6-8 years of age and conducted a series of incentivized experiments to elicit their social preferences." This demonstrates a randomized experimental design with a control group and follow-up measurement, qualifying as the strongest evidence tier.
The document provides limited detail on the magnitude of effects, specific measures of social preference, or whether both intervention arms showed similar benefits.
Across countries and designs
1 study · 3 countries
