Table 2.

Proportional hazards regression predicting 75 fatal and nonfatal lung cancer events among 3,295 smoking intervention participants enrolled in the Lung Cancer Substudy

Model	Coefficient	SE	Hazard ratio	95% CI	p value
1. Mean nicotine replacement therapy use, pieces per day over 5 years	.015	0.035	1.02	0.95–1.09	.67
2. Cigarette use, pack-years over 5 years	.079	0.037	1.08	1.01–1.16	.03
3. Mean nicotine replacement therapy use, cigarette use during study	.042	0.036	1.04	0.97–1.12	.25
	.093	0.039	1.10	1.02–1.19	.02

Note. Models are adjusted by baseline age, gender, cigarettes per day, and lifetime pack-years of smoking.