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Table 11 Asymptomatic ratios with 95% confidence interval based on combination of symptoms stratified by location: Kinmen (KM), Changhua (CH), Ilan (IL), and Taipei City (TP)

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

Symptoms Asymptomatic ratio stratified by area (%) P-value1
  KM CH IL TP  
Fever 64.8 (48.3-81.4) 73.9 (43.5-100) 84.9 (72.2-97.5) 45.2 (12.7-77.8) 0.0033
Fever + cough 76.5 (61.8-91.2) 76.2 (46.7-100) 87.9 (76.4-99.4) 29.2 (0.0-58.9) <.0001
Fever + (cough or vomiting) 71.4 (55.8-87.1) 76.2 (46.7-100) 87.9 (76.4-99.4) 10.5 (0.0-30.6) <.0001
Fever + (cough or headache) 64.6 (48.0-81.2) 76.2 (46.7-100) 87.9 (76.4-99.4) 20.0 (0.0-46.1) <.0001
Fever + (cough or nose) 66.7 (50.3-83.0) 76.2 (46.7-100) 84.9 (72.2-97.5) 20.0 (0.0-46.1) <.0001
Fever + (cough or vomiting or headache) 62.5 (45.7-79.3) 76.2 (46.7-100) 87.9 (76.4-99.4) 9.1 (0.0-27.9) <.0001
Fever + sore throat 82.0 (68.7-95.3) 100.0 (−) 87.9 (76.4-99.4) 22.2 (0.0-49.4) <.0001
Fever + ( sore throat or vomiting) 75.5 (60.6-90.4) 100.0 (−) 87.9 (76.4-99.4) 0.0 (−) <.0001
Fever + ( sore throat or headache) 68.8 (52.7-84.8) 100.0 (−) 87.9 (76.4-99.4) 15.8 (0.0-39.6) <.0001
Fever + ( sore throat or nose) 72.0 (56.4-87.6) 81.0 (53.7-100) 84.9 (72.2-97.5) 13.6 (0.0-36.1) <.0001
Fever + ( sore throat or vomiting or headache) 66.7 (50.3-83.0) 100.0 (−) 87.9 (76.4-99.4) 0.0 (−) <.0001
Any symptom 39.1 (22.2-56.0) 65.0 (31.9-98.1) 72.7 (57.1-88.4) 0.0 (−) <.0001
Fever + (cough or sore throat)* 74.0 (58.8-89.2) 76.2 (46.7-100) 84.9 (72.2-97.5) 17.4 (0.0-42.2) <.0001
Fever + (cough or sore throat or nose) + (headache or pain or tired)# 72.9 (57.5-88.3) 90.5 (70.1-100) 90.9 (80.8-100) 0.0 (−) <.0001
  1. *denotes US-CDC criteria for ILI; #denotes TCDC criteria for ILI.
  2. 1P-value from chi-square test.