Table S1.

Hardy-Weinberg equilibrium of ADORA2A single nucleotide polymorphisms (SNP) sites

SNPs	group	Gene type (frequency)	χ2	p
rs5996696	Control group	CC:5 (0.9%)	0.452	0.461
		AC:79 (14.8%)
	AA:451 (84.3%)
	Case group	CC:3 (0.8%)	0.076	0.783
		AC:58 (14.7%)
AA:334 (84.5%)
rs2298383	Control group	CC:93 (17.4%)	4.073	0.044*
		TC:286 (53.7%)
	TT:154 (28.9%)
	Case group	CC:105 (26.4%)	0.641	0.432
		TC:191 (48.0%)
TT:102 (25.6%)

Note: *P<0.05 (indicates statistical significance).