Table 3.

Demographic data for CAPS participants included and excluded from the current study

Characteristics		Included (n = 182)	Included, %/median (IQR)	Excluded (n = 820)	Excluded, %/median (IQR)
Gender	Male	74	41	345	42
	Female	108	59	475	58
Age at onset, years	5–10	101	55	306	37
	≥11	40	22	250	31
	Missing or <5	41	22	264	32
	Overall	153	8.8 (6.6–11.1)	602	10.2 (7–12.5)
JIA subtype	Systemic arthritis	8	4	55	7
	Persistent oligoarthritis	75	41	292	36
	Extended oligoarthritis	7	4	17	2
	Polyarthritis (RF−)	27	15	131	16
	Polyarthritis (RF+)	6	3	31	4
	ERA	12	7	58	7
	Psoriatic arthritis	15	8	68	8
	Unclassifiable JIA	32	18	110	13
	Other inflammatory arthritis	0	0	30	4
	ILAR missing	0	0%	26	3%
Core outcome variables	CHAQ	164	0.625 (0.125–1.375)	451	0.625 (0.125–1.25)
	Parent VAS	164	16.5 (4–49)	409	24 (5–50)
	Physician VAS	144	30 (16–53)	502	28 (15–49)
	Active joint count	165	2 (1–6)	611	2 (1–5)
	Limited joint count	165	1 (1–4)	611	1 (0–4)
	ESR	101	19 (7–44)	464	20 (7–50)