Validation of prediction models of severe disease course and non-achievement of remission in juvenile idiopathic arthritis: part 1—results of the Canadian model in the Nordic cohort

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 period^a	January 2005–December 2010	January 1997–June 2000
Total participants, n	1497	500
Time from onset to baseline study visit, months^b	5.8 (3.0–11.0)	7.0 (6.0–8.0)
Time from onset to outcome assessment, months^b	49 (38–59)^c	98 (95–102)
Participants in the current study, n	609	440
Inclusion criteria	6 of 8 study visits^d	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

ISSN: 1478-6362