TABLE 1.

Characteristics of Asthma Patients by Cluster Analysis

	Cluster 1 (n = 110)	Cluster 2 (n = 321)	Cluster 3 (n = 59)	Cluster 4 (n = 120)	Cluster 5 (n = 116)
Demographics	Younger, predominantly female	Slightly older, predominantly female	Older woman (mean age 50) with high BMI	Equal men and women	Predominantly women
Age of asthma onset	Childhood onset	Childhood onset	Adult onset	Childhood onset, long disease duration	Early adult onset, long disease duration
Atopy status	Atopic disease	Atopic disease	Less atopic	Atopic disease	Less atopic
Health care utilization	Infrequent	Infrequent	Moderate	High	High
Controller medication use	2 or fewer controller medications	Increased number of controllers	50% with 3 or more controller meds	Majority with 3 or more asthma drugs	Majority with 3 or more asthma drugs
Postbronchodilator FEV1 (% predicted)	113	94	84	76	58

Reprinted with permission of the American Thoracic Society. Copyright © 2013 American Thoracic Society.¹⁴ This modified table combines data from the original article available from http://www.atsjournals.org. Copyright American Thoracic Society, New York. All permission requests for this image should be made to the copyright holder.