Table 2.

Sensitivity analysis for sex difference of gastric cancer (current smoker versus never smoker and former smoker versus never smoker)

Outcomes	Excluding study	RRR and 95% CI	P value	Heterogeneity (%)	P value for heterogeneity
Current smoker versus never smoker	JACC 2005	1.27 (1.01–1.61)	0.045	56.8	0.018
	Kato 1992	1.30 (1.03–1.63)	0.026	57.8	0.015
	Tverdal 1993	1.27 (1.04–1.57)	0.022	47.8	0.053
	Engeland 1996	1.34 (1.06–1.70)	0.015	54.5	0.024
	Lindblad 2005	1.38 (1.15–1.66)	0.001	35.7	0.132
	Jee 2004	1.22 (0.97–1.53)	0.089	38.1	0.114
	Chao 2002	1.27 (0.97–1.66)	0.080	57.4	0.016
	Akiba 1990	1.30 (0.98–1.73)	0.068	55.1	0.023
	Gonzalez 2003	1.34 (1.06–1.69)	0.014	55.0	0.023
	Nomura 2012	1.33 (1.04–1.70)	0.023	56.1	0.020
Former smoker versus never smoker	JACC 2005	1.20 (0.90–1.59)	0.220	48.4	0.060
	Kato 1992	1.20 (0.92–1.58)	0.175	46.9	0.068
	Tverdal 1993	1.20 (0.91–1.58)	0.187	47.7	0.063
	Engeland 1996	1.15 (0.87–1.53)	0.332	47.7	0.063
	Lindblad 2005	1.31 (1.10–1.57)	0.002	5.7	0.386
	Jee 2004	1.10 (0.78–1.56)	0.592	46.2	0.072
	Chao 2002	1.17 (0.83–1.64)	0.364	46.0	0.073
	Gonzalez 2003	1.26 (0.96–1.64)	0.095	40.8	0.107
	Nomura 2012	1.11 (0.85–1.44)	0.445	28.8	0.199