Table 1.

Characteristic of studies included in the meta-analysis

Author	year	country	Ethnicity	Age group	Genotype Methods	Source of control	NOS score	HWE
Peddireddy et al [14]	2018	South Indian	Asia	Adult	PCR	PB	8	0.726
Phukan et al [9]	2014	Northeast India	Asia	Adult	PCR	PB	8	0.227
Ozen et al [16]	2013	Turkey	Caucasians	Adult	PCR	PB	7	0.920
Shi et al [12]	2014	China	Asia	Adult	PCR-SSP	PB	6	0.308
Cheon et al [15]	2000	Korea	Asia	Adult	PCR	–	6	0.133
Yaren et al [17]	2008	Turkey	Caucasians	Adult	PCR	–	7	0.470
Nacak et al [8]	2010	Turkey	Caucasians	Adult	PCR	PB	8	0.268
Wang et al [13, 21]	2000	China	Asia	Adult	PCR	–	6	0.861
Zhang et al [18]	2005	China	Asia	Adult	PCR	HB	7	0.109
Gao et al [11]	2012	China	Asia	Adult	PCR	HB	6	0.018
Devic Pavlic et al [10]	2012	Croatia	Caucasians	Adult	PCR	HB	7	0.909
Ding et al [19]	2008	China	Asia	Adult	PCR	HB	7	0.175