Table 1. Frequency of Genotype and Allele Polymorphisms of GAK rs1564282 among PD and Controls in Taiwan, Singapore and China.

	PD (%)	Controls (%)	OR (95% CI)	P-value
Taiwan
CC	381(78.9)	387(78.2)	1.00
CT	97(20.1)	104(21.0)	0.95(0.69–1.29)	0.73
TT	5(1.0)	4(0.8)	1.27(0.32–5.35)	0.74
CT+TT	102(21.1)	108(21.8)	0.96(0.71–1.30)	0.79
Common (C) allele	859(88.9)	878(88.7)	1.00
Minor (T) allele	107(11.1)	112(11.3)	0.98(0.74–1.29)	0.87
Singapore
CC	306(78.9)	311(79.9)	1.00
CT	77(19.8)	77(19.8)	1.02(0.71–1.45)	0.93
TT	5(1.3)	1(0.3)	5.07(0.69–121.3)	0.12
CT+TT	82(21.1)	78(20.1)	1.06(0.75–1.51)	0.71
Common (C) allele	689(88.8)	699(89.8)	1.00
Minor (T) allele	87(11.2)	79(10.2)	1.12(0.81–1.54)	0.50
Merged (Taiwan + Singapore)
CC	687(78.9)	698(78.9)	1.00
CT	174(20.0)	181(20.5)	0.98(0.77–1.23)	0.84
TT	10(1.1)	5(0.6)	2.03(0.69–6.61)	0.20
CT+TT	184(21.1)	186(21.1)	1.01(0.80–1.27)	0.99
Common (C) allele	1548(88.9)	1577(89.2)	1.00
Minor (T) allele	194(11.1)	191(10.8)	1.035(0.84–1.28)	0.75
China
CC	616(75.9)	616(80.8)	1.00
CT	183(22.5)	142(18.6)	1.29(1.01–1.65)	0.04
TT	13(1.6)	4(0.5)	3.25(1.10–11.61)	0.03
CT+TT	196(24.1)	146(19.2)	1.3(1.05–1.71)	0.02
Common (C) allele	1415(87.1)	1374(90.2)	1.00
Minor (T) allele	209(12.9)	150(9.8)	1.36(1.09–1.69)	0.007
Merged (Taiwan + Singapore + China)
CC	1303(77.4)	1314(79.8)	1.00
CT	357(21.2)	323(19.6)	1.12(0.94–1.32)	0.21
TT	23(1.4)	9(0.6)	2.58(1.21–5.88)	0.01
CT+TT	380(22.6)	332(20.0)	1.15 (0.9–1.36)	0.09
Common (C) allele	2963(88.0)	2951(89.6)	1.00
Minor (T) allele	403(12.0)	341(10.4)	1.18(1.01–1.37)	0.04

P-values and OR calculated in relation to CC genotype and a major allele C.

All p-values were calculated by means of chi-squared test.