Table 3.

Proportions of participants with adult-diagnosed asthma reporting the onset of asthma symptoms under 20 years of age. Allergic asthma was defined as self-report of asthma and allergy to pollen and/or animals and asthma symptoms on allergen exposure. Data are presented as n (%).

	All asthma	Allergic asthma	Non-allergic asthma	p-value between allergic andnon-allergic asthma
Asthma diagnosed at ≥30 years of age	33 (10.4)	19 (18.4)	14 (6.6)	0.001
Asthma diagnosed at ≥40 years of age	23 (9.2)	13 (17.3)	10 (5.7)	0.004
Asthma diagnosed at ≥50 years of age	9 (5.9)	3 (8.1)	6 (5.2)	0.51