Table 2.

Comparison of the 1960–1993 and 1994–2013 juvenile rheumatoid arthritis cohorts^*

	1960–1993 (n = 59)	1994–2013 (n = 59)	Total (n = 118)
Age at diagnosis, mean ± SD years	8.3 ± 4.8	7.2 ± 5.0	7.8 ± 4.9
Female	42 (71)	36 (61)	78 (66)
Race/ethnicity†
Caucasian	33 (56)	51 (86)	84 (71)
Black	0 (0)	3 (5)	3 (3)
Asian	0 (0)	3 (5)	3 (3)
Other	1 (2)	0 (0)	1 (1)
Unknown	25 (42)	2 (3)	27 (23)
Time from symptom onset to diagnosis,   mean ± SD years	7.5 ± 12.7	4.3 ± 4.7	5.9 ± 9.7
ACR classification
Pauciarticular	41 (69)	48 (81)	89 (75)
Polyarticular	11 (19)	9 (15)	20 (17)
Systemic	7 (12)	2 (3)	9 (8)

^*Except where indicated otherwise, values are the number (%). ACR = American College of Rheumatology.

^†P for trend < 0.001, 1960–1993 cohort versus 1994–2013 cohort.