Table 4. Association between ALDH2 rs671 G>A polymorphism and sex, smoking status and drinking status of the gastric cancer patients based on dominant models.

Subgroup analyses	Dominant model: GA + AA vs. GG
	Heterogeneity
	OR	95% CI	P value	I2	PHet	Effects model	No. of studies
Sex
Male	1.049	0.942–1.168	0.385	93.9%	<0.001	R	2
Female	1.053	0.905–1.224	0.506	0.0%	0.980	F	2
Smoking status
Smoker	1.212	0.851–1.728	0.286	0.0%	0.612	F	2
Nonsmoker	0.599	0.400–0.897	0.080	43.2%	0.184	F	2
Drinking status
Drinker	1.421	1.211–1.667	< 0.001	22.5%	0.257	F	7
Nondrinker	1.031	0.879–1.209	0.707	40.8%	0.119	F	7

F: fixed effects model; R: random effects model.