Table 1. Comparison of lung cancer incidence rates in our study and in the total Korean male population.

	Cohort in this study				Total Korean male population
Age	Total number	Person-years (pyrs)	Newly diagnosed lung cancer cases	Lung cancer incidence rate (/100,000 pyrs)†	Lung cancer incidence rate† (/100,000 pyrs)
30–34	236,521	2,674,905	111	4.2	1.5
35–39	251,249	2,834,072	257	9.2	3.5
40–44	245,257	2,729,318	598	21.9	9.9
45–49	179,481	1,984,644	1,033	52.2	20.3
50–54	149,536	1,628,114	1,537	94.4	44.9
55–59	120,381	1,277,575	2,104	164.7	104.1
60–64	72,428	731,329	2,090	285.8	197.4
65–69	29,232	270,031	1,170	433.3	350.7
70–74	17,051	142,821	793	555.2	513.4
75–80	8,008	58,725	314	534.7	655.7
Total	1,309,144	14,331,533	10,007	69.83	-

^†Ministry of Health, Welfare and Family Affairs. Annual report of cancer incidence (2005) and survival (1993–2005) in Korea, 2008; Cancer incidence in 2005 was used for comparison with study participants with follow-up period of 1996–2007.