Table 1.

Demographic and clinical features of pSS patients and healthy controls in this study.

	pSS patients (n = 21)	Healthy controls (n = 21)
Demographics
Age at onset	47.86 ± 11.55	45.86 ± 8.55
Sex (female)	21	21
Fever (n%)	2 (9.52%)	0
Joint pain (n%)	8 (38.10%)	0
ESSDAI (mean, S.D)	4.19 ± 2.54	N.D
Laboratory examinations
Anti-SSA antibody (+/−)	18/3	Negative
Anti-SSB antibody (+/−)	8/13	Negative
Anti-Ro-52 antibody (+/−)	17/4	Negative
IgG (g/L, mean ± S.D)	21.59 ± 7.05	10.04 ± 2.72
IgA (g/L, mean ± S.D)	3.02 ± 1.14	2.06 ± 0.69
IgM (g/L, mean ± S.D)	1.62 ± 0.69	0.99 ± 0.37
C3 (g/L, mean ± S.D)	0.98 ± 0.23	1.04 ± 0.16
C4 (g/L, mean ± S.D)	0.19 ± 0.19	0.19 ± 0.07
ESR (mm/h, mean ± S.D)	28.05 ± 1.57	5.93 ± 3.13
RF (IU/mL, mean ± S.D)	126.51 ± 129.68	5.13 ± 4.06
CRP (mg/L, mean ± S.D)	2.35 ± 3.38	N.D

N.D. represented for “Not detect”.