Demographics and characteristics of participants
| Variables | n (% (95% CI)) |
| Gender | |
| Male | 188 (64 (57.6 to 68.8)) |
| Female | 109 (37 (31.2 to 42.5)) |
| Age groups (years) | |
| 4–6 | 93 (31 (26.1 to 36.9)) |
| 7–12 | 148 (50 (44.0 to 55.7)) |
| 13–17 | 56 (19 (14.6 to 23.8)) |
| Age at diagnosis (years) | |
| 2–5 | 101 (34 (28.6 to 39.7)) |
| 6–12 | 185 (62 (56.5 to 67.8)) |
| More than 12 | 10 (3 (1.6—61)) |
| Concomitant allergies | |
| Allergic rhinitis | 147 (50 (43.7 to 55.3)) |
| Eczema | 54 (18 (14 to 23.1)) |
| Hay fever | 130 (44 (38.1 to 49.6)) |
| All types | 21 (7 (4.4 to 10.6)) |
| Family history of allergies | 192 (65 (58.9 to 70.1)) |
| Asthma | 53 (18 (13.7 to 22.7)) |
| Allergic rhinitis | 23 (8 (5 to 11.4)) |
| Eczema | 23 (8 (5 to 11.4)) |
| Hay fever | 36 (12 (8.6 to 14.4)) |
| Multiple allergies | 74 (25 (20.1 to 30.2)) |