| | Characteristic | Total (n) | Before COVID-19 (n) | During COVID-19 (n) |
| | Total (n) | 29,926 | 12,484 | 17,442 | | Sex (male/female) | 19,125/10,801 | 8,050/4,434 | 11,075/6,367 | | Age (mean ± SD) | 4.59 ± 3.103 | 4.21 ± 3.145 | 4.86 ± 3.043 | | Age group | | | | | Infant (n) | 8,353 | 4,444 | 3,909 | | Preschool (n) | 12,388 | 4,593 | 7,795 | | School (n) | 6,566 | 2,432 | 4,134 | | Adolescence (n) | 2,619 | 1,015 | 1,604 | | Season | | | | | Spring (3–5) (n) | 7,660 | 3,064 | 4,596 | | Summer (6–8) (n) | 8,122 | 3,306 | 4,816 | | Autumn (9–11) (n) | 8,154 | 3,109 | 5,045 | | Winter (12–2) (n) | 5,990 | 3,005 | 2,985 | | Allergen (n) | | | | | d1 | 6,107 | 2,854 | 3,253 | | d2 | 4,801 | 1,990 | 2,811 | | e2 | 21,510 | 5,063 | 16,447 | | mx2 | 26,334 | 9,699 | 16,635 | | Sycamore | 13,645 | 1,318 | 12,327 | | e1 | 14,460 | 1,318 | 13,142 | | w1 | 19,904 | 3,932 | 15,972 | | elm | 13,647 | 1,318 | 12,329 | | w6 | 19,656 | 4,156 | 15,500 | | i6 | 21,593 | 5,142 | 16,451 | | w14 | 1,592 | 1,131 | 461 | | t70 | 1,592 | 1,131 | 461 | | u80 | 19,898 | 3,932 | 15,966 | | f37 | 1,592 | 1,131 | 461 |
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Abbreviations. Dermatophagoides pteronyssinus (d1), Dermatophagoides farinae (d2), dog hair (e2), cat hair (e1), cockroaches (i6), mulberry (t70), sycamore pollen (sycamore), elm pollen (elm), grass pollen (u80), mugwort pollen (w6), common ragweed pollen (w1), amaranth (w14), green oysters (f37), and mold (mx2).
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