Table 1. Selected Characteristics of Prostate Cancer Population-Based Cases and Controls, King County, WA.
| Cases N = 1,754 |
Controls N = 1,645 |
p-value | |
|---|---|---|---|
| Age at reference date (years) | |||
| 35-49 | 139 (7.9) | 154 (9.4) | 0.25 |
| 50-54 | 258 (14.7) | 251 (15.3) | |
| 55-59 | 441 (25.1) | 438 (26.6) | |
| 60-64 | 518 (29.5) | 430 (26.1) | |
| 65-69 | 210 (12.0) | 202 (12.3) | |
| 70-74 | 188 (10.7) | 170 (10.3) | |
| Race | |||
| Caucasian | 1,548 (88.3) | 1,529 (93.0) | < 0.001 |
| African-American | 206 (11.7) | 116 (7.1) | |
| First-degree family history of prostate cancer | |||
| No | 1,388 (79.1) | 1,467 (89.2) | < 0.001 |
| Yes | 366 (20.9) | 178 (10.8) | |
| PSA screening within the past 5 years | |||
| None | 415 (23.7) | 606 (36.8) | < 0.001 |
| 1 – 2 PSAs | 429 (24.5) | 303 (18.4) | |
| ≥ 3 PSAs | 822 (46.9) | 478 (29.1) | |
| Unknown | 88 (8.0) | 258 (15.7) | |
| PSA at diagnosis (cases) or interview (controls) | |||
| 0.0 – 3.9 | 228 (13.0) | 1,259 (76.5) | < 0.001 |
| 4.0 – 9.9 | 976 (55.6) | 81 (4.9) | |
| ≥ 10 | 415 (23.7) | 18 (1.1) | |
| Missing | 135 (7.7) | 287 (17.5) | |
| History of sexually transmitted infection (any) | |||
| No | 1,484 (84.6) | 1,403 (85.3) | 0.58 |
| Yes | 270 (15.4) | 242 (14.7) | |
| Prostatitis | |||
| No | 1,535 (87.5) | 1,513 (92.0) | < 0.001 |
| Diagnosed ≤ 2 years of reference date | 67 (3.8) | 18 (1.1) | |
| Diagnosed > 2 years of reference date | 150 (8.6) | 114 (6.9) | |
| Number of female sexual partners | |||
| 0 – 1 | 366 (23.9) | 391 (26.8) | 0.03 |
| 2 – 14 | 843 (46.1) | 802 (48.8) | |
| ≥ 15 | 545 (31.1) | 452 (27.5) | |
| Number of male sexual partners | |||
| None | 1,696 (96.7) | 1,616 (98.2) | 0.02 |
| Any | 58 (3.3) | 29 (1.8) |