Increased IL-33 in Synovial Fluid and Paired Serum Is Associated with Disease Activity and Autoantibodies in Rheumatoid Arthritis

Table 1

Characteristics of enrolled patients with RA and OA.

Samples	Diseases	n	Gender		Age		Disease duration
			M/F	P	Range; (year, mean ± SD)	P	Range; (year, mean ± SD)	P
SF	RA	120	23/97	0.457	12–81 (53.8 ± 16.1)	0.111	0.3–30 (9.4 ± 8.4)	0.847
	OA	30	4/26		40–77 (57.8 ± 11.3)		0.1–30 (11.1 ± 8.4)
Serum	RA	54	6/48	0.347	23–81 (55.6 ± 13.4)	0.423	0.3–30 (8.2 ± 7.4)	0.524
	OA	12	3/9		53–72 (61.4 ± 10.4)		0.1–30 (6.6 ± 8.2)

RA: rheumatoid arthritis; OA: osteoarthritis; SF: synovial fluid.