Table 3. The mean PSA level (ng/mL) by the number of alleles across the 4 PSA-SNPs.

Number of alleles (1–8)	N	Mean (SD) PSA level (ng/mL)
1	4	4.57	(1.82)
2	55	3.55	(1.38)
3	203	3.60	(1.83)
4	253	3.28	(1.68)
5	249	3.09	(1.64)
6	82	2.75	(1.60)
7	21	2.34	(1.52)
8	1	2.08	(0.00)