. Author manuscript; available in PMC: 2019 Nov 19.

Published in final edited form as: Eur J Cancer Prev. 2017 Jul;26(4):324–329. doi: 10.1097/CEJ.0000000000000264

Table 4.

Results from the Cox proportional hazard models on overall mortality and lung cancer-specific mortality in the low-dose computed tomography group versus the control group, across strata of selected covariates (Italy, 2001–2011)

		Overall mortality		Lung cancer-specific mortality
	N	HR^a	95% CI	HR^a	95% CI
Age (years)
≤ 60	3158	0.86	0.55–1.33	0.52	0.23–1.21
> 60	3391	0.90	0.74–1.08	0.88	0.64–1.23
FEV1 (%)
< 80	759	0.99	0.65–1.50	1.03	0.56–1.89
≥ 80	5790	0.87	0.71–1.05	0.78	0.54–1.11
Pack-years
< 40	2806	1.03	0.73–1.46	0.53	0.27–1.04
≥ 40	3743	0.85	0.69–1.04	0.94	0.66–1.33
Current smokers	4515	0.87	0.70–1.07	0.78	0.54–1.11
Ex-smokers	1846	1.21	0.84–1.74	1.32	0.63–2.75

CI, confidence interval; FEV1, forced expiratory volume in 1 s; HR, hazard ratio.

Model adjusted for study, sex, age (<55, 55 to ≤60, >60 years old), FEV1 (<80%, ≥80%), pack-years (<30, 30 to <40, ≥40), as appropriate.