Comparison 5. Tumor stage.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Stage 0	11	3309	Odds Ratio (M‐H, Fixed, 95% CI)	0.58 [0.33, 1.02]
2 Stage I	11	3309	Odds Ratio (M‐H, Fixed, 95% CI)	1.20 [1.00, 1.43]
3 Stage II	11	3309	Odds Ratio (M‐H, Fixed, 95% CI)	1.01 [0.87, 1.17]
4 Stage III	11	3309	Odds Ratio (M‐H, Fixed, 95% CI)	0.93 [0.80, 1.08]
5 Stage IV	11	3309	Odds Ratio (M‐H, Fixed, 95% CI)	0.89 [0.65, 1.22]
6 Unknown	11	3309	Odds Ratio (M‐H, Fixed, 95% CI)	1.07 [0.69, 1.67]