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Confusion matrices for the three classification tasks complementary to the best results given in Table 4. Part A: (Task 1) pos vs neg, part B: (Task 2) pos+ vs neg+, part C: (Task 3) pos– vs neg–. neg, COVID-19 negative; pos, COVID-19 positive; UAR, unweighted average recall; +, symptomatic; –, asymptomatic.
