. Author manuscript; available in PMC: 2013 Apr 1.

Published in final edited form as: Arthritis Rheum. 2012 Feb 10;64(4):1263–1271. doi: 10.1002/art.34348

Table 1.

Characteristics of study cohorts

	All JIA	Asthma	ADHD
Number of children	7,812	652,234	321,821
Median age in years (IQR)	10.5 (6.3–13.7)	6.1 (2.8–11.0)	9.7 (7.7–12.0)
Female %	64	41	24
Race/Ethnicity %
White	52	38	64
African-American	17	31	20
Latino	20	20	6
Other/Unknown	11	11	10
Median follow-up in years (IQR)	1.1 (0.4–2.4)	0.7 (0.3–1.6)	0.9 (0.4–1.9)
Medication exposures
MTX	3423 (44%)
TNF inhibitors	1484 (19%)
Other immunomodulatory agents	398 (5%)

JIA = juvenile idiopathic arthritis; ADHD = attention-deficit hyperactivity disorder; IQR = inter-quartile range; MTX = methotrexate or leflunomide; TNF inhibitors = etanercept, infliximab, or adalimumab