Table 4.

Logistic regression model for “GSTM1 present/absent” and “GSTT1 present/absent”.

Variables	GSTM1 Present/Absent			GSTT1 Present/Absent
	Odds Ratio	95% Confidence Interval	p-Value	Odds Ratio	95% Confidence Interval	p-Value
Age (≤65/>65)	0.73	0.31–1.69	0.465	0.38	0.11–1.44	0.157
Smoking	1.93	1.59–2.35	0.008	0.61	0.11–3.28	0.563
Alcohol	0.84	0.37–1.91	0.690	5.87	1.27–27.18	0.023
Larynx/hypopharynx cancer	2.83	1.01–7.92	0.047	5.07	1.71–15.04	0.003