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The plots of the logistic model and the ROC curves for Tables8,9for Younger Schoolchildren of grades 1–3. (a) Logistic model of H1N1 influenza infection predicted by fever, headache, vomiting, and cough. (b) ROC curves of combination of symptoms for influenza infection prediction in last 3 rows of younger schoolchildren of grades 1–3 in Table 9, denoted respectively by (1), (2), and (3).
