Table 1.

Attributes of all included studies.

Publications	Ethnicity	Region	Total number of cases/controls	R1628P carriers of case/control	Age of case/control	Male ratio of case/control	NOS
2008 Lu et al. [17]	Chinese	Taiwan	843/543	62/20	65.7 ± 11.8/51.9 ± 18.4	58.9/41.3	8
2008 Ross et al. [19]	Chinese	Taiwan and Singapore	1079/907	66/31	NA	NA	8
2008 Ross et al. [19]	Non-Chinese	Japan	151/95	0/0	NA	NA	8
2008 Tan et al. (2) [20]	Chinese	Singapore	246/243	21/8	66 ± 12/62 ± 10	56.0/54.0	8
2008 Tan et al. (1) [21]	Non-Chinese	Malaysia and Indian	192/265	3/6	60.3 ± 6.4/64.5 ± 3.7	NA	9
2009 Zhang et al. [22]	Chinese	China	600/459	43/11	NA/53.4 ± 13.4	57.0/56.0	7
2009 Yu et al. [23]	Chinese	China	328/300	17/6	NA/58.2 ± 10.3	54.3/57.7	9
2009 Zabetian et al. [24]	Non-Chinese	Japan	631/320	0/0	NA	NA	9
2010 Kim et al. [15]	Non-Chinese	Korea	383/379	3/1	NA	NA	8
2011 Pulkes et al. [25]	Thai/Chinese	Thai	154/156	15/5	NA	56.5/NA	8
2012 Zhou et al. [16]	Chinese	China	202/212	2/5	62.68 ± 10.69/62.87 ± 10.44	52.5/59.0	8
2013 Fu et al. [13]	Chinese	China	446/403	47/21	60.82 ± 11.20/59.21 ± 9.3	59.0/62.0	9
2013 Wu-Chou et al. [12]	Chinese	Taiwan	747/461	58/18	NA	NA	8
2013 Cai et al. [26]	Chinese	China	510/550	29/19	58.4 ± 11.0/59.34 ± 11.3	59.4/58.2	9
2013 Wu et al. [27]	Chinese	Taiwan	573/503	34/22	62.1 ± 11.5/59.4 ± 12.9	55.3/50.7	8
2014 Pulkes et al. [11]	Non-Chinese	Thai	485/480	54/29	65.0 ± 12.0/71.0 ± 7.0	46.0/61.0	9
2014 Gopalai et al. [10]	Non-Chinese	Malaysia	695/507	43/18	57.4 ± 11.8/59.3 ± 9.4	60.0/51.0	8
2015 Guo et al. [28]	Chinese	China	1019/1030	49/44	57.9 ± 12.3/57.2 ± 16.4	58.5/48.0	9

NOS: Newcastle–Ottawa Scale. NA: not available.