Table 4.

Association between circumcision status and prostate cancer, by ancestry, among subjects participating in the PROtEuS, Montréal, Québec, Canada, 2005–2009

Ancestry	Circumcised (N = 1216) †		Not circumcised (N = 1899)†		OR (95% CI) *	P-value for circumcision–ancestry interaction term
	Cases n (%)	Controls n (%)	Cases n (%)	Controls n (%)
White	526 (50.0)	525 (50.0)	814 (50.7)	790 (49.3)	0.95 (0.80–1.12)	–
Black	22 (41.5)	31 (58.5)	81 (64.8)	44 (35.2)	0.40 (0.19–0.86)	0.02
Asian	6 (23.1)	20 (76.9)	19 (27.5)	50 (72.5)	1.09 (0.28–4.20)	0.92
Other	33 (38.4)	53 (61.6)	42 (41.6)	59 (58.4)	0.79 (0.40–1.56)	0.61

^*Models adjusted for age at diagnosis for cases and age at interview for controls, family history of prostate cancer, ever had an STI, prostate cancer screening ≤2 years, highest education level achieved.

^†There were 13 circumcised and 13 uncircumcised men for whom ancestry was unknown.