Table 2. Clinical characteristics of the RA group.

	Under 60 (n = 24)	Over 60 (n = 38)	P value
Male/Female (N)	6/18	9/29
Age (Mean ± SEM)	50.50 ± 1.51	67.26 ± 0.97	0.013*
CRP (mg/L)	7.81 ± 1.63	15.74 ± 2.54	0.03*
ESR (mm/h)	36.30 ± 4.52	40.89 ± 3.67	0.447
RF (IU/ml)	348.82 ± 78.11	379.32 ± 81.79	0.781
IgG (IU/ml)	1,491.00 ± 52.4	1,392.37 ± 66.74	0.33
IgA (IU/ml)	338.25 ± 27.57	301.06 ± 21.11	0.31
IgM (IU/ml)	133.80 ± 12.03	102.24 ± 6.97	0.02*
IgE (IU/ml)	96.31 ± 24.79	93.61 ± 18.84	0.93
CEA (ng/ml)	1.69 ± 0.14	2.46 ± 0.21	0.016*
CA19-9 (IU/ml)	9.97 ± 1.89	15.43 ± 2.45	0.14
CA125 (IU/ml)	13.51 ± 0.91	20.37 ± 3.01	0.169
	Male (n = 15)	Female (n = 47)	P value
Age (Mean ± SEM)	60.00 ± 2.69	61.02 ± 1.55	0.746
CRP (mg/L)	13.77 ± 3.07	12.18 ± 2.07	0.715
ESR (mm/h)	40.29 ± 4.14	38.73 ± 3.52	0.823
RF (IU/ml)	544.68 ± 179.55	303.99 ± 47.74	0.11
IgG (IU/ml)	1,498.00 ± 86.92	1,401.40 ± 54.91	0.384
IgA (IU/ml)	381.00 ± 33.99	292.12 ± 18.35	0.028*
IgM (IU/ml)	112.00 ± 13.82	113.51 ± 7.37	0.922
IgE (IU/ml)	170.78 ± 43.89	72.63 ± 12.79	0.006**
CEA (ng/ml)	2.05 ± 0.15	2.22 ± 0.19	0.637
CA19-9 (IU/ml)	8.76 ± 1.15	14.94 ± 2.18	0.136

Notes:

^*P < 0.05.

^**P < 0.01.