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The problem
Intervention: 32-week school-based physical exercise program combined with visual accommodation training tasks
Who it was tested with: First-grade children aged 6-7 years (163 students across intact school classes).
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.
"A total of 163 first-grade students were allocated by intact classes to an experimental group (n = 82), which received a 32-week physical exercise program incorporating visual tasks designed to stimulate ciliary-muscle accommodation, or a control group (n = 81), which received standard physical education" with measurements "at baseline, mid-intervention, and post-intervention." This demonstrates a quasi-experimental pre-post design with a comparison group evaluating the intervention's effect on visual acuity outcomes.
Allocation by intact classes rather than individual randomisation may introduce classroom-level confounding. The document does not report effect sizes or describe potential limitations in statistical power. Generalisability to other age groups or educational contexts is unclear.
Across countries and designs
1 study · 0 countries
