. 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 2.

Association between bladder cancer and its risk factors among Egyptians, stratified by superoxide dismutase 2 (SOD2) genotypes

Risk factor	SOD2 genotype

	CC n = 382	TC or CT n = 766	TT n = 501
Smoking
Never	Ref.	Ref.	Ref.
Water pipe only	1.20 (0.47–3.11)^a	1.08 (0.56–2.09)	2.43 (1.08–5.45)
Cigarette only	1.14 (0.57–2.26)	0.92 (0.55–1.55)	2.26 (1.22–4.20)
Both	2.56 (0.97–6.74)	1.43 (0.69–2.96)	4.41 (1.86–10.42)
Schistosomiasis history
No	Ref.	Ref.	Ref.
Yes	3.59 (2.21–5.84)	1.86 (1.33–2.60)	1.81 (1.17–2.79)

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.