Impact of SNP-SNP interactions of DNA repair gene ERCC5 and metabolic gene GSTP1 on gastric cancer/atrophic gastritis risk in a Chinese population

Table 1 Baseline characteristics of the subjects n (%)

Variable	AG vs CON		GC vs CON
	CON	AG	CON	GC
	n = 620	n = 634	n = 535	n = 450
Gender	P = 0.492		P = 0.588
Male	362 (58.4)	358 (56.5)	363 (67.9)	298 (66.2)
Female	258 (41.6)	276 (43.5)	172 (32.1)	152 (33.8)
Age	P = 0.845		P = 0.235
mean ± SD	54.7 ± 9.1	54.8 ± 9.0	55.6 ± 9.2	56.3 ± 10.1
Median	54	55	56	57
Range	17-85	16-82	17-85	26-84
H. pylori infection status	P < 0.001		P < 0.001
Positive	168 (27.1)	377 (59.5)	143 (26.7)	223 (49.6)
Negative	452 (72.9)	257 (40.5)	392 (73.3)	227 (50.4)

AG: Atrophic gastritis; GC: Gastric cancer; CON: Controls.