Table 6.

Correlation between EZH2 and smoking in six studies.

Study	OR	EZH2 high		EZH2 low
		Yes	No	Yes	No
Kikuchi et al. 2010 [16]	8.69	74	11	24	31
Takawa et al. 2011 [17]	3.64	114	21	94	63
Chen et al. 2013 [14]	4.90	14	4	10	14
Geng et al. 2015 [21]	1.02	50	46	51	48
Toyokawa et al. 2018 [23]	5.50	22	1	12	3
Li et al. 2014 [12]	0.23	10	12	25	7