Clinimetric properties of the Chinese version of the early inflammatory arthritis detection tool

Table 1 Demographic characteristic of participants (N = 131)

Variable	Total	Group						p
		Control	Rheumatoid arthritis	Osteoarthritis	SAD	Psoriatic arthritis	Ankylosing spondylitis
	131 (100)	20 (15.3)	31 (23.7)	20 (15.3)	20 (15.3)	20 (15.3)	20 (15.3)
Age (years)								<0.001
Mean (SD)	51.6 (15.1)	42.4 (14.5)^a	57.3 (14.9)^b	65.4 (10.2)^b	47.2 (12.4)^abc	49.5 (11.9)^abc	44.6 (13.7)^abc	<0.001
Sex								<0.001
Male	50 (38.2)	7 (35)^abc	7 (23)^ab	5 (25)^ab	3 (15)^ab	12 (60)^abc	16 (80)^c
Female	81 (61.8)	13(65)	24 (77)	15 (75)	17 (85)	8 (40)	4 (20)

Age across groups were compared using non-parametric Kruskal-Wallis test and Mann–Whitney test with Dunn-Sidak adjustment was applied to control for the probability of Type I errors in pairwise comparisons
Sex distribution across groups were compared using Fisher’s exact test and Dunn-Sidak adjustment was applied in the pairwise comparisons
SAD systemic autoimmune diseases including progressive systemic sclerosis, Sjögren’s syndrome, and systemic lupus erythematosus
Figures with different superscript were significantly different at p < 0.05

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