Table 1. Systematic review of the randomised trials assessing lung cancer screening by low-dose computed tomography (LDCT)

	DANTE [9]	NSLT [10,#11]	DLCST [12,#13]
Control	Usual care	Chest radiograph	Usual care
Participants screened
Control arm	1276	26 722	2052
LDCT	1196	26 732	2052
Overall mortality
Relative risk (95% CI)	0.97 (0.80–1.20)	0.93 (0.86–0.99)	1.19 (1.01–1.40)
Number needed to screen to prevent one event	635	219	NR
Lung cancer-specific mortality
Relative risk (95% CI)	0.97 (0.71–1.32)	0.80 (0.73–0.93)	1.15 (0.83–1.61)
Number needed to screen to prevent one event	954	320	NR

Data are presented as n, unless otherwise stated. NLST: National Lung Screening Trial; DLCST: Danish Lung Cancer Screening Trial; NR: not reported. Data from [8].