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

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

ISSN: 1471-2407