Table 2.

Number of cases and controls, ORs and 95% CIs for bladder cancer according to duration smoked and number of cigarettes smoked per day

Males
Females
Cases/controlsOR* (95% CI)Cases/controlsOR* (95% CI)
Duration smoked (y)
    Never smoked55/2271.0Never smoked106/1401.0
    <2035/791.8 (1.1-3.0)<3013/102.0 (0.6-6.1)
    20-2995/1412.8 (1.8-4.1)≥3013/27.2 (1.4-37.1)
    30-39214/2024.4 (3.1-6.4)P = 0.009
    40-49287/1896.5 (4.6-9.3)
    ≥50298/1468.9 (6.2-12.9)
P < 0.0001
Cigarettes smoked per day
    Never smoked57/2271.0Never smoked106/1401.0
    1-19247/2753.5 (2.5-5.0)1-1910/53.0 (0.8-10.6)
    20-39530/3406.8 (4.9-9.5)≥2015/73.7 (1.1-12.3)
    ≥40168/1564.8 (3.3-6.9)P = 0.035
P < 0.0001
Pack-years
TertilesMedian
    Never smoked55/2271.0Never smoked106/1401.0
    0-25171/2552.8 (1.9-3.9)1-147/71.8 (0.5-7.0)
    25-51368/2596.2 (4.4-8.6)>1417/54.4 (1.3-15.4)
    >51385/2357.1 (5.0-10.0)P = 0.02
P < 0.0001
  • * Adjusted for age, hospital region, fruit/vegetable consumption, and high-risk occupation.