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Table 7 Univariate analysis of influenza-like symptoms for grade stratification

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

Symptom Seroconversion for Influenza Tested Negative for Influenza P-value
Grades 1-3 n = 39 n = 52  
Fever 29 (74.4%) 17 (32.7%) <.0001
Sore throat 16 (48.5%) 14 (33.3%) .2370
Cough 31 (86.1%) 30 (63.8%) .0261*
Headache 16 (48.5%) 6 (13.6%) .0018*
Vomiting 9 (31.0%) 4 (10.0%) .0341*
Running nose 23 (76.7%) 41 (87.2%) .3497
Stomach upset 4 (15.4%) 3 (7.7%) .4240
Grades 4-6 n = 41 n = 107  
Fever 24 (58.5%) 19 (17.8%) <.0001*
Sore throat 21 (65.6%) 34 (38.6%) .0125*
Cough 28 (80.0%) 74 (77.1%) .8152
Headache 15 (53.6%) 20 (25.6%) .0100*
Vomiting 8 (33.3%) 7 (9.9%) .0191*
Running nose 32 (86.5%) 72 (77.4%) .3327
Stomach upset 6 (25.0%) 8 (11.0%) .1033
  1. *denotes statistically significant at 5% level.