Table I.

Characteristics of study cohorts including individuals with asthma from 5 health plans in the nationwide Population-Based Effectiveness in Asthma and Lung Diseases Network.

	Prelabel change			Postlabel change
Characteristic	Jan 2006	Jan 2007	Jan 2008	Jul 2009	Jul 2010
Total No.	125,577	136,799	136,223	149,913	161,351
Adolescents, %	22	21	18	19	20
Young adults, %	16	16	16	16	16
Adults, %	63	63	66	65	63
Adolescents, No.	27,280	28,862	24,596	28,593	32,576
Female, %	47	46	46	47	46
High SES,*%	52	52	52	52	51
Young adults, No.	19,541	21,733	21,936	24,595	26,472
Female, %	62	61	62	62	62
High SES,*%	54	54	54	55	54
Adults, No.	78,756	86,204	89,691	96,725	102,303
Female, %	67	66	67	67	67
High SES,*%	55	55	55	55	55

SES = socioeconomic status.

^*On the basis of US Census data. High SES indicates members residing in neighborhoods where >25% of adults are college educated.