Intention-to-Treat Analysis of Changes in Mathematics Test and Physical Fitness Scores After 1 Academic Year Between the Intervention and Control Groups 
myopia
REGRESSION, MYOPIA, SECONDARY
Abbreviations: BMI, body mass index (calculated as weight in kilograms divided by height in meters squared); NA, not applicable.Primary outcome was the between-group mean difference in mathematics test scores after 1 academic year. Secondary outcomes were overall physical fitness scores and myopia incidence after 1 academic year. The remaining outcomes in this table were exploratory outcomes.Normality in the distribution of continuous data was checked using the Kolmogorov-Smirnov normality test. Linear regression models assessed the differences between the 2 groups in the mathematics test scores and physical fitness scores at baseline and at the end of 1 academic year, as well as changes in these variables after 1 academic year. All analyses took into account the cluster effects within schools.Bonferroni correction was applied to multiple comparisons for secondary outcomes (physical fitness score and myopia incidence), and the corrected 