Table 1.

JIA-study population in the Canadian ReACCh-Out and the Nordic JIA cohort

Characteristics	Canadian development cohort	Nordic validation cohort
Study design	Prospective multicenter	Prospective multicenter
Patient recruitment perioda	January 2005–December 2010	January 1997–June 2000
Total participants, n	1497	500
Time from onset to baseline study visit, monthsb	5.8 (3.0–11.0)	7.0 (6.0–8.0)
Time from onset to outcome assessment, monthsb	49 (38–59)c	98 (95–102)
Participants in the current study, n	609	440
Inclusion criteria	6 of 8 study visitsd	Baseline and 8-year study visit
Main outcome	Severe disease course	Non-achievement of remission

^aNewly diagnosed JIA patients

^bMedian interquartile range (IQR)

^cSevere disease course outcome was assessed over time, not at a single point

^dAdditionally, at least one value available for each of the five patient-relevant variables