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.

Years since quitting^a

Lifetime Cigarette Frequency of Use^c

<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 Homogeneity^d (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 Homogeneity^d (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 Homogeneity^d (p-value)

0.45

^a The number of participants may vary because of missing data

^b Compared with nonsmokers. Adjusted for: age, education, race, ethnicity, diabetes, pancreatitis, gallbladder disease, alcohol intake and body mass index

^c Includes smokers who quit ≥1 year prior to diagnosis/interview

^d Breslow-Day test

Tranah et al. BMC Cancer 2011 11:138   doi:10.1186/1471-2407-11-138