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Table 2

ORs and 95% CIs for the association of vasectomy with risk of prostate cancer, King County, Washington, 1993–1996

Vasectomy statusNo. (%) of casesNo. (%) of controlsORa95% CI
Ever     
 No 456 (60.6) 438 (62.3) 1.00b  
 Yes 297 (39.4) 265 (37.7) 1.10 0.9 –1.4 
Age at vasectomy     
 20–29 yrs 49 (6.5) 47 (6.7) 1.15 0.7 –1.8 
 30–34 yrs 84 (11.2) 66 (9.4) 1.30 0.9 –1.9 
 35–39 yrs 82 (10.9) 74 (10.5) 1.07 0.7 –1.6 
 ≥40 yrs 82 (10.9) 77 (11.0) 0.96 0.7 –1.4 
   Trend testd P = 0.24 
Years since vasectomyc     
 <5 8 (1.1) 10 (1.4) 0.68 0.2 –1.9 
  5–9 14 (1.9) 21 (3.0) 0.68 0.3 –1.5 
 10–14 30 (4.0) 35 (5.0) 0.94 0.5 –1.6 
 15–19 63 (8.4) 58 (8.3) 1.11 0.7 –1.7 
 20–24 81 (10.8) 64 (9.1) 1.11 0.8 –1.6 
 25–29 63 (8.4) 46 (6.5) 1.42 0.9 –2.2 
 ≥30 38 (5.0) 30 (4.3) 1.23 0.7 –2.1 
   Trend testd P = 0.11 
Year of vasectomy     
 1952–1968 81 (10.8) 61 (8.7) 1.37 0.9 –2.0 
 1969–1974 100 (13.1) 80 (11.4) 1.16 0.8 –1.7 
 1975–1979 62 (8.2) 61 (8.7) 1.01 0.7 –1.5 
 1980–1984 34 (4.5) 31 (4.4) 1.14 0.7 –1.9 
 1985–1989 8 (1.1) 21 (3.0) 0.38 0.1 –0.9 
 1990–1995 12 (1.6) 10 (1.4) 1.00 0.4 –2.6 
   Trend testd P = 0.09 
Vasectomy statusNo. (%) of casesNo. (%) of controlsORa95% CI
Ever     
 No 456 (60.6) 438 (62.3) 1.00b  
 Yes 297 (39.4) 265 (37.7) 1.10 0.9 –1.4 
Age at vasectomy     
 20–29 yrs 49 (6.5) 47 (6.7) 1.15 0.7 –1.8 
 30–34 yrs 84 (11.2) 66 (9.4) 1.30 0.9 –1.9 
 35–39 yrs 82 (10.9) 74 (10.5) 1.07 0.7 –1.6 
 ≥40 yrs 82 (10.9) 77 (11.0) 0.96 0.7 –1.4 
   Trend testd P = 0.24 
Years since vasectomyc     
 <5 8 (1.1) 10 (1.4) 0.68 0.2 –1.9 
  5–9 14 (1.9) 21 (3.0) 0.68 0.3 –1.5 
 10–14 30 (4.0) 35 (5.0) 0.94 0.5 –1.6 
 15–19 63 (8.4) 58 (8.3) 1.11 0.7 –1.7 
 20–24 81 (10.8) 64 (9.1) 1.11 0.8 –1.6 
 25–29 63 (8.4) 46 (6.5) 1.42 0.9 –2.2 
 ≥30 38 (5.0) 30 (4.3) 1.23 0.7 –2.1 
   Trend testd P = 0.11 
Year of vasectomy     
 1952–1968 81 (10.8) 61 (8.7) 1.37 0.9 –2.0 
 1969–1974 100 (13.1) 80 (11.4) 1.16 0.8 –1.7 
 1975–1979 62 (8.2) 61 (8.7) 1.01 0.7 –1.5 
 1980–1984 34 (4.5) 31 (4.4) 1.14 0.7 –1.9 
 1985–1989 8 (1.1) 21 (3.0) 0.38 0.1 –0.9 
 1990–1995 12 (1.6) 10 (1.4) 1.00 0.4 –2.6 
   Trend testd P = 0.09 
a

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 the reference date (0, 1–2, 3–4, ≥5).

b

Reference group for all ORs related to vasectomy.

c

Analysis excludes one control with missing information.

d

Trend test based on exposed subjects only.

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