Figure 4From: Asymptomatic ratio for seasonal H1N1 influenza infection among schoolchildren in Taiwan The plots of the logistic model and the ROC curves for Tables 8 , 9 for Older Schoolchildren of grades 4–6. (a) Logistic model of H1N1 influenza infection predicted by fever, headache, vomiting, and sore-throat. (b) ROC curves of combination of symptoms for influenza infection prediction in last 3 rows of Table 9, denoted respectively by (1), (2), and (3).Back to article page