Table 3

ORs for the association of vasectomy with risk of prostate cancer according to clinical characteristics of cancer patients, King County, Washington, 1993–1996

CharacteristicVasectomy statusORa95% CI
No (n = 456)Yes (n = 297)
Stage at diagnosis
 A66 (14.5)b48 (16.2)1.190.8 –1.8
 B262 (57.5)177 (59.6)1.160.9 –1.5
 C77 (16.9)47 (15.8)1.040.7 –1.6
 D39 (8.6)18 (6.1)0.780.4 –1.4
 Unk12 (2.6)7 (2.4)
Gleason grade
 2–451 (11.2)35 (11.8)1.230.8 –2.0
 5–7318 (69.7)228 (76.8)1.220.9 –1.6
 8–1080 (17.5)31 (10.4)0.660.4 –1.0
 Unk7 (1.5)3 (1.0)
Symptomsc at diagnosis
 No297 (65.1)206 (69.4)1.140.9 –1.5
 Yes159 (34.9)90 (30.3)1.020.7 –1.4
  • a ORs for each stratum of cases compared to the same set of controls (438 with vasectomy, 265 without vasectomy), computed by polychotomous logistic regression; ORs adjusted for age (continuous), race, family history of prostate cancer (none, first-degree relative, second-degree relative only), and number of PSA blood tests within 5 years before reference date (0, 1–2, 3–4, ≥5).

  • b Data represent the number of cases followed by the percentage of cases in parentheses.

  • c One case had missing information on symptoms at diagnosis; this variable was based on whether the patient reported having any symptoms at the time of the initial physician visit which led to the diagnosis of prostate cancer.