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Confusion matrix of classification performance of the test subset in the four severity groups among pediatric patients. The color reference is associated with the proportion (%) of subjects of the actual class assigned in each severity group. At the top, the values of the 4-class accuracy (Acc4) and the 4-class Cohen’s kappa coefficient (k) are shown. * No OSA: AHI<1 (e/h); Mild OSA: 1≤AHI<5 (e/h); Moderate OSA: 5≤AHI<10(e/h); Severe OSA: AHI≥10(e/h).
