Table 1. Lung cancer CT screening: results of observational studies.

						Lung cancers
	Subjects	Age (years) a	NSM b	p-y c	CT lesions d	Baseline e	Stage I f	First repeat g
Henschke et al, 1999	1000	67	0	45	233 (23)	27 (2.7)	85	—
Sone et al, 2001	5483	64	54	—	588 (11)	23 (0.4)	100	27 (0.5)
Nawa et al, 2002	7956	56	38	—	541 (7)	36 (0.5)	78	4 (0.1)
Sobue et al, 2002	1611	59	14	—	186 (12)	14 (0.9)	71	22 (1.4)
Diederich et al, 2004	817	53	0	45	350 (43)	12 (1.5)	64	—
Swensen et al, 2003	1520	59	0	45	780 (51)	27 (1.7)	74	13 (0.9)
Pastorino et al, 2003	1035	58	0	40	199 (19)	11 (1.1)	55	11 (1.1)
Bastarrika et al, 2005	911	55	0	30	291 (32)	12 (1.3)	83	2 (0.2)
Chong et al, 2005	6406	55	23	—	2,255 (35)	23 (0.4)	56	—
Novello et al, 2005	519	59	0	—	241 (47)	5 (1.0)	67	3 (0.6)
MacRedmond et al, 2006	449	55	0	45	111 (25)	2 (0.4)	50	4 (0.9)
I-ELCAP 2006	31 567	61	17	30	4186 (13)	410 (1.3)	85	74 (0.2)
Veronesi et al, 2008	5201	58	0	44	2754 (53)	55 (1.1)	66	37 (0.7)
Overall	64 475	59	20	—	12 715 (20)	657 (1.0)	81	197 (0.3)

Abbreviations: CT=computed tomography; NSM=non-smokers; p-y=pack-years.

^aMedian age of participants.

^bProportion of non-smokers.

^cMedian pack-years.

^dSubjects with suspicious non-calcified solid lesions (percentage of participants).

^eLung cancers detected at baseline (percentage of participants).

^fPercentage of lung cancers detected in stage I at baseline.

^gLung cancers detected at first annual CT repeat.