Serum RANKL levels in Chinese patients with ankylosing spondylitis: a meta-analysis

Table 1 Characteristics of included studies

Author	Year	Region	Language	Study type	Criteria for disease	Case	Control	Case	Control	Case	Control	Disease durations	Source for control	Method	NOS
An et at.	2010	Hebei	Chinese	Case–control	New York (1984)	30	20	30/0	20/0	28 ± 8	30 ± 5	7 ± 7	HB	Elisa	7
Shen et al.	2019	Liaoning	Chinese	Case–control	New York (1984)	202	98	102/100	49/49	43.4 (24–65)	44.8 (22–65)	–	HB	Elisa	7
Chen et al.	2010	Taiwan	English	Case–control	New York (1984)	42	26	38/4	–	33.6 ± 12.14	–	8.17 ± 8.2	NA	Elisa	7
Hou et al.	2018	Shandong	English	Case–control	New York (1984)	40	40	31/9	31/9	31.7 ± 2.1	31.4 ± 2.5	7.4 ± 1.9	PB	Elisa	7
Li et al.	2013	Guangdong	Chinese	Case–control	New York (1984)	44	15	32/12	9/6	31 ± 0.7	29 ± 0.4	–	HB	Elisa	7
Luo et al.	2011	Jiangsu	Chinese	Case–control	New York (1984)	44	44	23/21	22/22	42.2 ± 11.9	4. ± 11.1	7.3 ± 4.8	HB	Elisa	7
Wei et al.	2013	Guangdong	Chinese	Case–control	New York (1984)	40	40	40/0	40/0	33.67 ± 6.88	30.95 ± 6.04	12.63 ± 9.68	NA	Elisa	7
Zhang et al.	2018	Hebei	Chinese	Case–control	New York (1984)	46	38	30/16	28/10	27.2 ± 8	25.26 ± 8.67	7.6 ± 3.8	HB	Elisa	7
Zhao et al.	2010	Fujian	Chinese	Case–control	New York (1984)	23	17	16/7	9/8	33 ± 14	52 ± 14	–	PB	Elisa	7
Huang et al.	2018	Zhejiang	Chinese	Case–control	New York (1984)	21	42	6/15	15/26	44.48 ± 19.77	46.24 ± 17.79	–	HB	Elisa	7
Zhang et al.	2015	Guangdong	Chinese	Case–control	ASAS	21	21	18/4	17/5	31 ± 9	30 ± 9	6 ± 3	HB	Elisa	7
Zhang et al.	2020	Guangdong	English	Case–control	ASAS	32	22	25/7	18/4	28.5 (15–26)	30.5 (18–56)	4.68 ± 3.63	PB	Elisa	7
		Province										Years

M = male, F = female. NOS = Newcastle–Ottawa Scale, HB = hospital based, PB = population based

ISSN: 1749-799X