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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.