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Table 4 Odds Ratios (OR) and 95% confidence intervals (CI) for pancreatic cancer (PanCA) associated with cigarette smoking cessation in relation to frequency of use compared with nonsmokers, San Francisco Bay Area, California.

From: Cigarette, cigar and pipe smoking, passive smoke exposure, and risk of pancreatic cancer: a population-based study in the San Francisco Bay Area

  Years since quittinga  
Lifetime Cigarette Frequency of Usec <10 >=10
  OR (95% CI)b OR (95% CI)b
<40 years smoked 1.3 (0.81 - 2.2) 1.0 (0.76 - 1.3)
>=40 years smoked 1.8 (1.1 - 2.9) 0.99 (0.56 - 1.7)
Test for Homogeneityd (p-value)   0.29
<20 cigarettes/day 1.8 (1.2 - 2.8) 0.96 (0.71 - 1.3)
>= 20 cigarettes/day 1.3 (0.75 - 2.2) 1.0 (0.73 - 1.5)
Test for Homogeneityd (p-value)   0.26
<40 packyears 1.8 (1.1 - 2.8) 0.96 (0.73 - 1.3)
>= 40 packyears 1.4 (0.83 - 2.3) 1.2 (0.74 - 1.8)
Test for Homogeneityd (p-value)   0.45
  1. a The number of participants may vary because of missing data
  2. b Compared with nonsmokers. Adjusted for: age, education, race, ethnicity, diabetes, pancreatitis, gallbladder disease, alcohol intake and body mass index
  3. c Includes smokers who quit ≥1 year prior to diagnosis/interview
  4. d Breslow-Day test