Characteristics	Controls	HFMD			HFMD concurrent infection			Anti-infection HFMD
Characteristics	n = 50	n = 50	P value		n = 50	P value		n = 50	P value
Age (years) mean ± SD	2.62 ± 0.65	2.64 ± 0.72	0.4422		2.65 ± 0.74	0.215		2.65 ± 0.74	0.4150
gender, N (%)
Male	32 (64.0)	33 (66.0)	0.8339		31 (62.0)	0.8359		31 (62.0)	0.8359
Female	18 (36.0)	17 (34.0)	0.8339		19 (38.0)	0.8359		19 (38.0)	0.8359