Sympathetic skin response in patients with systemic sclerosis and rheumatoid arthritis

Table 3 Average values of SSR in the three groups (control group, SSc group, and RA group)

	Control group (I) (N = 60)	SSc group (II) (N = 21)	RA group (III) (N = 39)	Overall P value
Average latency of SSR (ms)	1545 ± 132	1890 ± 153	1722 ± 121	0.03*
Average amplitude of SSR (mv)	2.77 ± 1.4	1.21 ± 0.7	1.71 ± 0.11	0.04*
Post hoc test	(I) vs (II) 0.04*	(II) vs (III) 0.02*	(III) vs (I) 0.05*

SSR sympathetic skin response, SSc systemic sclerosis, RA rheumatoid arthritis
*Statistically significant