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Characteristics of the study participants.
| Number of patients (N = 3,475) | Percentage (%) | |
| Gender | ||
| Female | 1,092 | 31.42 |
| Male | 2,383 | 68.58 |
| Age | ||
| <6 years old | 2,134 | 61.41 |
| ≥6 years old | 1,341 | 38.59 |
| Past history | ||
| Rhinitis | 360 | 10.36 |
| Eczema | 779 | 22.42 |
| Family history | ||
| Rhinitis | 784 | 22.56 |
| Asthma | 110 | 3.17 |
| Urticaria | 35 | 1.00 |
