Table I.

Distributions for selected characteristics among Caucasian prostate cancer cases and controls, King County, Washington, 1993–1996 and 2002–2005

Characteristic	Cases (n=1,310)		Controls (n=1,259)
	N	%	n	%
Age (years)
< 50	102	7.8	105	8.3
50–59	522	39.9	519	41.2
60–69	542	41.4	491	39.0
70–74	144	11.0	144	11.4
Family history of prostate cancer
No	1,027	78.4	1,118	88.8
Yes	283	21.6	141	11.2
Number of PSA testsa
None	290	22.1	445	35.4
1–2	321	24.5	239	19.0
3–4	244	18.6	153	12.2
≥ 5	392	29.9	225	17.9
Missing	63	4.8	197	15.7
PSA
0 – 3.9	179	13.7	1,169	92.9
4 – 9.9	721	55.0	74	5.9
10 – 19.9	189	14.4	14	1.1
20+	118	9.0	2	0.2
Missing	103	7.9
Stage of disease
Local	1,020	77.9
Regional	257	19.6
Distant	33	2.5
Gleason score
Low (2–4)	70	5.3
Moderate [5–7 (3+4)]	1,034	78.9
High [7 (4+3), 8–10]	202	15.4
Missing	4	0.3
Cancer aggressiveness
Less aggressive b	870	66.4
More aggressive c	440	33.6

^aPSA tests done in the 5 years before reference date.

^bLocal stage, and Gleason score 2–6 or 7 (3 + 4), and diagnostic serum PSA <20 ng/mL.

^cRegional/distant stage, or Gleason score 7 (4 + 3) or 8–10, or serum PSA ≥20 ng/mL.