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The problem
Intervention: None evaluated; this is an observational study examining natural variation in pandemic exposure
Who it was tested with: 3,760 children (51.5% female, 83.6% White) enrolled in public preschools in Uruguay, mean age 8.53 years at follow-up.
Experience from people who deliver programmes: stories, case studies and lessons learned. Valuable for understanding how and why, and for spotting what to test next, but not a measure of effect.
"Participants were 3,760 children enrolled in public preschools in Uruguay, assessed with the Child Development Inventory at ages 4 and 5 (2019-2020) and later with the national third-grade assessment (2023). Simulating what would have occurred if the pandemic had not affected development, results suggested that children would have achieved higher mathematics and reading scores if their cognitive and motor development had not been affected." This design uses longitudinal measurement with simulated comparison groups to estimate pandemic effects on school readiness and later achievement.
Results depend on simulation methodology and assumptions about counterfactual trajectories. The small effect sizes limit practical implications. Causality cannot be definitively established from observational data.
Across countries and designs
50 studies · 32 countries
Confirmed by a peer reviewer
A reviewer checked the classification against the source.
claude-haiku-4-5-20251001 · synth-v1
