. Author manuscript; available in PMC: 2015 Jan 1.

Published in final edited form as: Urol Oncol. 2013 Sep 10;32(1):10.1016/j.urolonc.2013.06.016. doi: 10.1016/j.urolonc.2013.06.016

Table 4.

Association between bladder cancer and its risk factors among Egyptians, stratified by combinations of genotypes for SOD2 and NQO1

Risk factor	Combined genotypes

	NQO1 (CC) and SOD2 (CC) n = 231	NQO1 TC/TT and SOD2 TT n = 202
Smoking
Never	Ref.	Ref.
Water pipe only	1.60 (0.50–5.12)^a	1.98 (0.87–4.48)
Cigarette only	0.96 (0.41–2.25)	1.49 (0.81–2.74)
Both	2.75 (0.77–9.77)	2.43 (1.03–5.77)
Schistosomiasis history
No	Ref.	Ref.
Yes	4.41 (2.32–8.38)	1.85 (1.24–2.77)

Odds ratio and (95% confidence interval) adjusted for age (continuous), education, residence (urban vs. rural), gender, environmental tobacco smoke, and for either history of schistosomiasis or smoking.