Table 2: Disease-specific characteristics.
| 
 | Adults | Children | 
| Mean age when respondent experienced first symptoms, years (n) | 16 (87) | 6 (289) | 
| Mean age of diagnosis, years (n)a | 17 (86) | 7 (287) | 
| Comorbidities, % (n) | ||
| Asthma | 60% (52) | 44% (127) | 
| Allergies affecting the respondents the most, % (n) | ||
| Allergies to animals (dogs, cats, horses, etc.) | 22% (19) | 23% (67) | 
| Allergies to pollen (grasses, weeds, trees, etc.) | 40% (35) | 54% (155) | 
| Allergies to house dust mites | 30% (26) | 22% (63) | 
| Other year-round allergies (cockroaches, mold etc.) | 8% (7) | 1% (4) | 
| Allergy symptoms, % (n) | ||
| Stuffy nose, runny nose, sneezing or post-nasal drip | 87% (76) | 88% (254) | 
| Itchy, red or watery eyes | 78% (68) | 80% (230) | 
| Shortness of breath, chest tightness or pain, coughing or wheezing | 61% (53) | 59% (170) | 
| Itchy skin reactions, skin pain or redness of skin | 33% (29) | 37% (107) | 
| The symptoms are troublesome | 86% (75) | 90% (261) | 
| Monoallergic vs. Polyallergic, % (n) | ||
| Monoallergic | 29% (25) | 24% (69) | 
| Polyallergic | 71% (62) | 76% (220) | 
| Medication use, % (n) | ||
| Oral antihistamines | 80% (70) | 85% (246) | 
| Decongestants | 74% (64) | 78% (226) | 
| Nasal sprays and drops | 71% (62) | 73% (212) | 
| Eye drops | 64% (56) | 59% (170) | 
| Medication use every day (of those using the medication), % (n) | ||
| Oral antihistamines | 21% (15) | 26% (63) | 
| Decongestants | 17% (11) | 18% (40) | 
| Nasal sprays and drops | 15% (9) | 17% (37) | 
| Eye drops | 14% (8) | 15% (26) | 
aMean age of diagnosis is reported for respondents who have been diagnosed by a physician.