Table 2.

Passive smoking and risk of pancreatic cancer in the Nurses' Health Study (1982–2006)

Passive smoking	Cases	Person-years	Age-adjusted RR (95% CI)	Multivariable RR (95% CI)*
Parental smoking
Neither parent	117	580,686	1.0 (Reference)	1.0 (Reference)
Mother†	93	425,299	1.54 (1.17–2.04)	1.42 (1.07–1.89)
Father†	211	1,129,815	1.02 (0.81–1.28)	0.97 (0.77–1.21)
Unknown	33	159,870	1.13 (0.77–1.67)	1.00 (0.68–1.48)
Currently exposed at work or home
None	38	236,796	1.0 (Reference)	1.0 (Reference)
Occasionally	181	943,701	1.14 (0.83–1.56)	1.11 (0.81–1.52)
Regularly, work or home	73	356,846	1.16 (0.84–1.61)	1.01 (0.72–1.40)
Regularly, work and home	36	178,937	1.27 (0.83–1.94)	0.97 (0.63–1.51)
Unknown	56	240,420	1.36 (0.87–2.12)	1.17 (0.75–1.83)
Years lived with smoker as adult
<5	116	691,234	1.0 (Reference)	1.0 (Reference)
5–19	86	504,792	1.04 (0.79–1.38)	0.99 (0.75–1.32)
20–29	71	346,066	1.03 (0.76–1.39)	0.91 (0.67–1.23)
30+	74	245,127	1.11 (0.82–1.51)	0.92 (0.67–1.26)
Unknown	37	169,480	1.19 (0.82–1.72)	1.02 (0.70–1.49)

^*Multivariate models adjusted for age, height (quintiles), smoking (never, quit ≥15 y, quit 5 to <15 y, quit <5 y, current <15 cigarettes/d, current 15–24 cigarettes/d, current 25+ cigarettes/d), diabetes (yes/no), and BMI (quintiles).

^†Included 14,843 women (70 cases) whose both parents were smokers.