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The indirect treatment effect on non-remedial students remaining in smaller, more homogeneous classrooms was 0.133 standard deviations (statistically insignificant, with a 95% confidence interval ranging from -0.076 to 0.189).
Private vocational schools employed a higher proportion of teachers with only secondary school training and fewer teachers with advanced degrees compared to public schools, yet voucher recipients attending these private schools achieved 0.33 to 0.66 standard deviation higher scores on national examinations.
Providing unadapted textbooks, flip charts, or extra formal teachers produced zero statistically significant improvements (0.00 standard deviation) in average student test scores.