Table 3. Mortality (SMR) due to cancer in emergency responders (ERs) (reference: Korean men).

Site of cancer		All ERs	Firefighters				Non-firefighters
			Total	< 10 years	10–20 years	≥20 years
	Person-years	377,703	342,233	128,790	148,004	65,079	35,470
All	N	177	167	43	48	76	10
	SMR	0.58	0.58	0.66	0.51	0.59	0.55
	95%CI	0.50–0.67	0.50–0.68	0.48–0.89	0.38–0.68	0.47–0.74	0.26–1.01
Stomach	N	35	34	11	9	14	1
	SMR	0.61	0.63	0.89	0.50	0.60	0.29
	95%CI	0.43–0.85	0.43–0.88	0.44–1.59	0.23–0.95	0.33–1.00	0.00–1.62
Colorectum	N	13	12	2	5	5	1
	SMR	0.66	0.65	0.46	0.81	0.63	0.83
	95%CI	0.35–1.14	0.34–1.14	0.05–1.67	0.26–1.90	0.20–1.48	0.01–4.59
Liver & intrahepatic bile duct	N	50	50	14	13	23	0
	SMR	0.52	0.55	0.69	0.43	0.58	-
	95%CI	0.39–0.69	0.41–0.73	0.38–1.16	0.23–0.73	0.37–0.87	-
Bronchus & lung	N	28	26	6	7	13	2
	SMR	0.59	0.58	0.69	0.53	0.56	0.82
	95%CI	0.39–0.85	0.38–0.84	0.25–1.48	0.21–1.10	0.30–0.96	0.09–2.96
Leukemia	N	6	6	1	3	2	0
	SMR	0.61	0.66	0.33	0.83	0.81	-
	95%CI	0.22–1.32	0.24–1.44	0.00–1.86	0.17–2.42	0.09–2.91	-
Lymphohematopoietic cancer	N	16	15	4	6	5	1
	SMR	0.89	0.91	0.80	0.96	0.96	0.72
	95%CI	0.51–1.45	0.51–1.50	0.21–2.04	0.35–2.08	0.31–2.23	0.01–4.03

N, number of case; SMR, standardized mortality ratio; CI, confidence interval