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Table 2 Select characteristics of bladder cancer cases and controls from the NECSS, 1994–1997

From: Silica and asbestos exposure at work and the risk of bladder cancer in Canadian men: a population-based case-control study

CharacteristicCasesControls 
N%N%OR a95% CI
Age at interview
 40- < 50527.913710.1  
 50- < 6012619.223917.6  
 60- <  7028343.058142.7  
  ≥ 7019729.940329.6  
Province of residence
 Newfoundland426.41057.7  
 Prince Edward Island152.3634.6  
 Nova Scotia609.130722.6  
 Manitoba8813.41269.3  
 Saskatchewan629.41208.8  
 Alberta19629.826519.5  
 British Columbia19529.637427.5  
Proxy respondent
 No40561.690266.31.00 
 Yes25338.545833.71.301.06–1.59
Cigarette pack-years
 Never smoker7611.630222.21.00
  > 0- < 106710.222316.41.150.79–1.68
 10- < 2012018.223317.11.931.37–2.72
 20- < 3012619.221415.72.391.70–3.38
 30- < 4012118.414710.83.532.46–5.07
  ≥ 4013720.821716.02.701.91–3.81
 Unknown111.7241.81.720.79–3.73
 p-trend    < 0.001 
Ever exposure to aromatic amines at work
 No65299.1134899.11.00 
 Yes60.9120.91.360.49–3.79
Highest attained concentration of diesel emissions exposure
 Unexposed40261.186963.91.00 
 Low16224.637727.70.880.70–1.10
 Medium6610.0896.51.461.03–2.08
 High284.3251.82.601.47–4.61
 p-trend    0.007 
Self-reported exposure to wood dust at work
 No50676.9102775.51.00 
 Yes15223.133324.50.970.77–1.21
Self-reported exposure to mineral/lube oil at work
 No49675.4113383.31.00 
 Yes16224.622716.71.601.27–2.03
Self-reported exposure to welding dust at work
 No49074.5110181.01.00 
 Yes16825.525919.01.441.15–1.81
Self-reported exposure to benzene at work
 No61693.6131396.51.00 
 Yes426.4473.51.971.27–3.07
Self-reported exposure to benzidine at work
 No63997.1134498.81.00 
 Yes192.9161.22.621.31–5.23
 Total658100.01360100.0  
  1. aPresented odds ratios (OR) are adjusted for age at interview, province of residence, and proxy respondent.