An updated meta-analysis of the asporin gene D-repeat in knee osteoarthritis: effects of gender and ethnicity

Table 1 Features of the included articles

Study	Ethnicity	Country	Study design	Gender (female/male)		Participants (number)
				Case	Control	Case	Control
Jiang et al. [37]	Asian	China	Case control	NA	NA	218	454
Kizawa et al. [13]	Asian	Japan	Case control	NA	NA	393	374
Kizawa et al. [13]	Asian	Japan	Cohort	NA	NA	137	234
Song et al. [16]	Asian	Korea	Case control	152/38	154/222	190	376
Atif et al. [36]	Caucasian	USA	Case control	NA	NA	775	511
Jazayeri et al. [35]	Caucasian	Iran	Case control	72/28	72/28	100	100
Kaliakatsos et al. [34]	Caucasian	Greece	Case control	NA	NA	155	190
Mustafa et al. [32]	Caucasian	UK	Case control	158/120	392/356	278	748
Rodriguez-Lopez et al. [33]	Caucasian	Spain	Case control	153/35	115/179	188	294
Arellano et al. [21]	Latin American	Mexico	Case control	130/88	130/92	218	222
González-Huerta et al. [38]	Latin American	Mexico	Case control	NA	NA	93	118
Total				665/309	863/877	2745	3621

ISSN: 1749-799X