. 2020 Oct 27;124(3):658–662. doi: 10.1038/s41416-020-01131-w

Table 3.

Crude^a- and multivariate^b adjusted hazard ratio (HR) estimates for lung cancer with 95% confidence intervals (CIs) for former smokers according to years since quit smoking, the Norwegian Women and Cancer Study, 1991–2015.

	Cases	HR^a (95% CI)	HR^b (95% CI)
Current smokers		1.00 (ref)	1.00 (ref)
1–9 years	90	0.34 (0.28–0.42)	0.37 (0.30–0.45)
10–19 years	56	0.16 (0.12–0.21)	0.17 (0.13–0.23)
>20 years	46	0.11 (0.08–0.14)	0.11 (0.08–0.15)
P-trend		<0.001	<0.001

^aAdjusted for age.

^bAdjusted for age, duration of education and alcohol consumption, all at enrolment.