Table 1 Demographic and clinical characteristics of vaccinated pupils vs. unvaccinated pupils
Characteristic | Vaccinated (N = 168) N (%) | Unvaccinated (N = 359) N (%) | P | |
|---|---|---|---|---|
Grade (N = 527) | second | 133/168 (79.2%) | 119/359 (33.1%) | < 0.001 |
Gender (N = 524) | Male | 86/166 (51.8%) | 171/358 (47.8%) | 0.4 |
Prior influenza vaccination (N = 523) | 97/168 (57.7%) | 122/355 (34.4%) | < 0.001 | |
Vaccination of household members (N = 526) | 94/167 (56.3%) | 74/359 (20.6%) | < 0.001 | |
Clinical manifestations during winter season | ILI | 13/168 (7.7%) | 70/359 (19.5%) | < 0.001 |
Fever | 32/168 (19.0%) | 110/359 (30.6%) | 0.006 | |
Cough | 27/168 (16.1%) | 126/359 (35.1%) | < 0.001 | |
Headache | 40/168 (23.8%) | 110/359 (30.6%) | 0.1 | |
Malaise | 34/168 (20.2%) | 114/359 (31.8%) | 0.007 | |
Number of physician visits (N = 527) | 25/168 (14.9%) | 128/359 (35.7%) | < 0.001 | |
School days lost (N = 527) | 43/168 (25.6%) | 154/359 (42.9%) | < 0.001 | |
Emergency room or urgent medical care visit (N = 527) | 6 (3.6%) | 19 (5.3%) | 0.5 | |
Hospitalization (N = 527) | 0 (0.0%) | 2 (0.6%) | 1.0 | |
ILI symptoms among household members (N = 527) | 42 (25.0%) | 124 (34.5%) | 0.03 | |