Sex as an effect modifier in the association between alcohol intake and gastric cancer risk

Table 1 Summary of previous systematic reviews for evaluating the association between alcohol intake and gastric cancer risk

Ref.	Searching	Selected studies (Cohort)	Group	Summary relative risk (95% confidence interval)	I2 (%)
Han et al[7], 2017	Dec-16	23	Both, HLL	1.17 (1.00-1.34)	79.6
		7	Men, HLL	1.18 (1.06-1.30)	0
		1	Women, HLL	1.13 (0.79-2.25)	0
Wang et al[9], 2017	Dec-16	17	Both, HLL	1.19 (1.06-1.34)	37.6
		34	Men, HLL	1.21 (1.06-1.37)	68.2
		12	Women, HLL	1.18 (0.95-1.47)	26.2
He et al[8], 2017	Apr-17	22	Both, HLL	1.03 (0.99-1.08)	21.9
			Men, heavy	1.13 (1.06-1.22)	28.1
			Women, heavy	1.33 (0.79-2.24)	2.4

HLL: Highest versus lowest level.