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Differences in the mixed microbial exposure index (I) between schools. Boxplot: box = 25th, 50th (median), and 75th percentiles of mixed microbial exposure indices; lower and upper whiskers = 10th and 90th percentiles; closed circles = outliers; and an open circle inside the box = an arithmetic mean. The total number of samples was 125. ***P ≤ 0.01 using pairwise multiple comparisons with Scheffé’s correction
