Table 2 Demographic and clinical characteristics of 2nd grade pupils (vaccinated cohort) vs. 3rd grade pupils (non-vaccinated cohort)
Character | Second grade (N = 256) N (%) | Third grade (N = 280) N (%) | P | |
|---|---|---|---|---|
Gender (N = 527) | male | 135/250 (54.0%) | 123/277 (44.4%) | 0.3 |
Previous vaccination (N = 526) | 116/252 (46.0%) | 104/274 (38.0%) | 0.06 | |
Vaccination of household members (N = 528) | 90/252 (35.7%) | 78/276 (28.3%) | 0.08 | |
Clinical manifestations (N = 536) | ILI | 29/256 (11.3%) | 57/280 (20.4%) | 0.005 |
fever | 61/256 (23.8%) | 84/280 (30.0%) | 0.1 | |
cough | 63/256 (24.6%) | 93/280 (33.2%) | 0.03 | |
headache | 75/256 (29.3%) | 78/280 (27.9%) | 0.8 | |
malaise | 68/256 (26.6%) | 82/280 (29.3%) | 0.5 | |
Physician visit (N = 536) | 66/256 (25.8%) | 90/280 (32.1%) | 0.1 | |
Number of children who missed school (N = 536) | 82/256 (32.0%) | 118/280 (42.1%) | 0.02 | |
Emergency room or urgent medical care visit (N = 536) | 14/256 (5.5%) | 11/280 (3.9%) | 0.4 | |
Hospitalizations (N = 536) | 1/256 (0.4%) | 1/280 (0.4%) | 1.0 | |
ILI symptoms among household members (N = 536) | 70/256 (27.3%) | 99/280 (35.4%) | 0.05 | |
Total vaccinated (N = 527) | 133/252 (52.8%) | 35/276 (12.7%) | < 0.001 | |