. Author manuscript; available in PMC: 2010 Mar 14.

Published in final edited form as: J Allergy Clin Immunol. 2007 Feb;119(2):405–413. doi: 10.1016/j.jaci.2006.11.639

TABLE V.

Clinical characteristics of severe asthma based on age of asthma onset

	Onset < 12 years (n = 100)	Onset ≥12 years (n = 104)	P value
Current age (y)	34 ± 13	48 ± 10	<.0001
Asthma duration (y)	32 ± 13	19 ± 11	<.0001
Sex (% female)	60%	68%	.24
Race (% white/African American/other)	61/30/9	72/21/7	.25
Baseline lung function
FEV₁ % predicted	64 ± 21	59 ± 21	.63
FVC % predicted	81 ± 21	73 ± 19	.004
FEV₁/FVC %	.65 ± .14	.64 ± .13	.50
Maximal % change in FEV₁	20 ± 20	21 ± 27	.77
Fe_NO (ppb)	38 ± 35	41 ± 41	.69
Blood eosinophils (log)	−.75 ± .47	−.76 ± .54	.84
Total serum IgE (log)	2.2 ± .69	1.9 ± .79	.19