Table 1.
Demographic characteristics and medical history according to COVID-19 waves.
| Variable | COVID-19 waves | ||||
|---|---|---|---|---|---|
| First (n = 4) | Second (n = 150) | Third (n = 386) | Fourth (n = 831) | p-Value* | |
| Gender | |||||
| Male | 4 (100%) | 68 (45.3%) | 211 (54.7%) | 421 (50.8%) | 0.137 |
| Female | 0 (0.0%) | 82 (54.7%) | 175 (45.3%) | 409 (49.2%) | |
| Age | |||||
| Infants (0–1 years) | 0 (0.0%) | 10 (6.7%) | 29 (7.5%) | 66 (7.9%) | <0.001 |
| Preschoolers (2–5 years) | 0 (0.0%) | 14 (9.3%) | 94 (24.4%) | 168 (20.2%) | |
| Scholars (6–11 years) | 2 (0.0%) | 2 (0.0%) | 2 (0.0%) | 2 (0.0%) | |
| Adolescents (12–15 years) | 77 (51.3%) | 109 (28.2%) | 234 (28.2%) | 77 (51.3%) | |
| Medical history | |||||
| No previous comorbidities | 3 (75.0%) | 103 (68.7%) | 276 (71.5%) | 534 (64.3%) | 0.039 |
| Previous comorbidities | 1 (25.0%) | 47 (31.3%) | 110 (28.5%) | 297 (35.7%) | |
| Overweight | 0 (0.0%) | 5 (3.3%) | 10 (2.6%) | 30 (3.6%) | 0.650 |
| Obesity | 0 (0.0%) | 13 (8.7%) | 20 (5.2%) | 49 (5.9%) | 0.306 |
| Asthma | 1 (25.0%) | 12 (8.0%) | 40 (10.4%) | 119 (14.3%) | 0.032 |
| Rhinitis | 0 (0.0%) | 18 (12.0%) | 43 (11.1%) | 178 (21.4%) | <0.001 |
| Previous contact with a family member with COVID-19 | |||||
| Positive contact | 1 (25.0%) | 129 (86.0%) | 329 (85.2%) | 750 (90.3%) | 0.025 |
| COVID-19 vaccine status | |||||
| Unvaccinated | 4 (100%) | 4 (100%) | 4 (100%) | 4 (100%) | <0.001 |
| Vaccinated | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) | |
| Unknown | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) | |
Data are presented as frequencies (percentages). Chi-square was performed for comparisons only among the second, third and fourth COVID-19 waves.
*Comparison between the initial and final measure; A p-value ≤0.05 was considered statistically significant.