Interleukin-17 SNPs and serum levels increase ulcerative colitis risk: A meta-analysis

Table 2 Baseline characteristics and methodological quality of the included studies focused on serum interleukin-17 levels

Ref.	Year	Country	Ethnicity	Number		Gender (M/F)		Age (yr)		Detection method	NOS score
				Case	Control	Case	Control	Case	Control
Ohman et al[14]	2013	China	Asian	99	10	70/29	4/6	32	48	ELISA	6
Liu[38]	2013	China	Asian	20	30	-	-	-	-	ELISA	7
Lin et al[37]	2012	China	Asian	50	50	22/28	25/25	38.0 ± 6.0	37.0 ± 5.0	ELISA	7
Chen[36]	2012	China	Asian	24	20	10/14	7/13	37.6 ± 9.4	38.9 ± 9.9	ELISA	7
Zhen et al[35]	2011	China	Asian	54	30	30/24	19/11	40.9 ± 8.3	50.6 ± 5.3	ELISA	7
Luo et al[34]	2011	China	Asian	24	30	14/10	17/13	-	-	ELISA	8
Xin et al[33]	2010	China	Asian	29	26	18/11	13/13	41.4 ± 9.6	32.0 ± 11.2	ELISA	6
He et al[32]	2010	China	Asian	25	10	12/13	-	-	-	ELISA	8
Rovedatti et al[31]	2009	United Kingdom	Caucasian	34	38	-	-	35.6 (14-53)	-	ELISA	8
Liang et al[30]	2005	China	Asian	40	30	28/12	19/11	41.5 ± 12.0	41.3 ± 12.0	ELISA	8

F: Female; M: Male; NOS: Newcastle-Ottawa Scale.