. Author manuscript; available in PMC: 2011 Feb 24.

Published in final edited form as: Tob Control. 2008 Apr 4;17(3):198–204. doi: 10.1136/tc.2007.022582

Table 5a.

Relative risks (95% CI) for lung cancer by histologic type, from the polytomous logistic regression model #2 comparing risks associated with current and former smoking, Nurses’ Health Study, 1976-2002. A. Final model with corresponding p-values for the differences between the histologic types

	Histologic Type
	Squamous Cell Carcinoma	Small Cell Carcinoma	Adenocarcinoma	Large Cell Carcinoma	p-value^*
Age (yr)	1.08 (1.06, 1.11)	1.06 (1.04, 1.09)	1.07 (1.06, 1.09)	1.03 (0.99, 1.06)	0.0295
Cigs/day (current) (per cig)	1.05 (1.04, 1.06)	1.07 (1.06, 1.09)	1.05 (1.04, 1.06)	1.06 (1.04, 1.07)	0.0034
Cigs/day (former) (per cig)		1.04 (1.04, 1.05)			0.5854
Duration (per year)	1.10 (1.07, 1.12)	1.12 (1.09, 1.14)	1.06 (1.05, 1.07)	1.07 (1.04, 1.11)	0.0002

P-value for test of heterogeneity