(b)

SNP	Genotype	Number	Grade 1 (0–9)	Grade 2 (10–18)	Grade 3 (19–29)	Grade 4 (30–63)	aOR (95% CI) P value	bFisher's exact test P value
rs35697037	AA+ AG	64	42 (65.6)	13 (20.3)	7 (11.0)	2 (3.1)	1.96
	GG	39	29 (74.4)	7 (17.9)	3 (7.7)	0 (0.0)	(0.50–7.75)
							0.3284	0.5280
rs16979956	TT+CT	1	0 (0.0)	1 (100.0)	0 (0.0)	0 (0.0)	0
	CC	102	71 (69.6)	19 (18.6)	10 (9.8)	2 (2.0)	—
							0.7152	1.0000
rs1877752	TT+CT	4	2 (50.0)	1 (25.0)	1 (25.0)	0 (0.0)	2.67
	CC	99	69 (69.7)	19 (19.2)	9 (9.1)	2 (2.0)	(0.25–27.92)
							0.3960	0.3955
rs16997078	GG + AG	4	3 (75.0)	0 (0.0)	1 (25.0)	0 (0.0)	2.67
	AA	99	68 (68.7)	20 (20.2)	9 (9.1)	2 (2.0)	(0.25–27.92)
							0.3960	0.3955

^aGrade 1 + Grade 2 versus Grade 3 + Grade 4. ^b20% of cells has expected count less than 5, Fisher's exact test would be performed.