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Table 6 Multivariate predictors of influenza infection with PPV, NPV, sensitivity, and specificity analyses with 95% confidence intervals (in parenthesis)

From: Asymptomatic ratio for seasonal H1N1 influenza infection among schoolchildren in Taiwan

Symptom PPV NPV Sensitivity Specificity
Fever 59.6 (51.5-67.1) 82.0 (76.8-86.2) 66.3 (54.8-76.5) 77.4 (70.1-83.6)
Fever + headache 77.4 (61.0-88.3) 75.7 (71.7-79.3) 39.3 (27.1-52.7) 94.3 (88.5-97.7)
Fever + headache + cough 77.8 (59.9-89.1) 75.7 (71.8-79.2) 36.8 (24.4-50.7) 94.9 (89.3-98.1)
Fever + headache + throat 75.0 (60.2-85.6) 79.0 (74.4-82.9) 48.2 (34.7-62.0) 92.4 (86.0-96.5)
Fever + headache + vomiting (model 1) 90.5 (69.7-97.5) 77.9 (73.6-81.6) 39.6 (25.8-54.7) 98.1 (93.2-99.8)
Fever + headache + vomiting + grade (model 2) 67.4 (55.3-77.5) 84.0 (78.0-88.5) 64.6 (49.5-77.8) 85.6 (77.3-91.7)