Table 1. Comparison of age, sex, body mass index, and laboratory findings between group 1 and group 2.

	Group 1 (n=40)				Group 2 (n=20)		p
	n	%	Mean±SD	n	%	Mean±SD
Age (year)			51.1±10.8			47.3±12.8	0.096
Sex							0.246
Female	27	67.5			9	45
Male	13	32.5			11	55
Body mass index (kg/m2)			26.4±3.8			26.2±3.0	0.950
Erythrocyte sedimentation rate (mm/h)			31.2±18.0			12.8±7.8	<0.001
High sensitive C-reactive protein (mg/L)			7.6±6.7			2.2±0.5	<0.001
Anti-cyclic citrullinated peptide (U/mL)			249.8±208.8			20.0±0.0	<0.001
Rheumatoid factor (IU/mL)			136.2±203.9			9.0±0.0	<0.001
SD: Standard deviation; Mann-Whitney U test was used.