Table 5.

Risk factors for multi primary cancers in males (N = 53).

Univariate analysis
	Incidence rate (%)	p value
Age
≥60 years	45.9	0.38
<60 years	31.3
Brinkman index
≥600	v34.4	0.25
<600	52.6
Sake index
≥60	35.5	0.76
<60	41.2
Site
Anterior	54.8	0.03
Posterior	22.7
Multivariate analysis
	Odd ratio (95% CI)	p value
Brinkman index
≥600	0.31 (0.08–1.17)	0.08
<600	1.00 (ref)
Site
Anterior	5.03 (1.28–19.7)	0.02
Posterior	1.00 (ref)