Table 1. Characteristics of 146 uranium miners in 16 strata defined by exposure to radon (Rn) assessed as working level months (WLM) and arsenic (As) and lung cancer.

Exposure	Characteristics	Total	Cancer-free	Adeno-carcinoma	Squamous cell carcinoma	Small cell lung cancer
Rn high As high(N = 40)	N	40	10	10	10	10
	Age [years] (median, range)	65, 56–84	67, 58–84	62, 56–73	67, 56–77	65, 56–80
	Miners with silicosis	27	9	7	6	5
	Smoking ever/never/missing	33/1/6	8/0/2	9/1/0	8/0/2	8/0/2
	Arsenic [µg/m3 years]	229	236	202	327	189
	Radon [WLM]	1879	1987	1763	2041	1368
	Quartz [mg/m3 years]	23.9	26.6	24.4	22.6	22.7
Rn high As low(N = 37)	N	37	10	10	7	10
	Age [years] (median, range)	66, 55–86	70, 58–84	66, 57–81	64, 56–82	62, 55–86
	Miners with silicosis	18	8	5	3	2
	Smoking ever/never/missing	30/2/5	8/1/1	7/1/2	7/0/0	8/0/2
	Arsenic [µg/m3 years]	0	0	0	5	9
	Radon [WLM]	1250	1251	1270	1256	1223
	Quartz [mg/m3 years]	21.9	20.2	26.8	22.3	19.0
Rn low As high(N = 33)	N	33	10	7	7	9
	Age [years] (median, range)	66, 48–80	72, 48–79	66, 60–72	70, 55–79	63, 55–80
	Miners with silicosis	14	4	3	2	5
	Smoking ever/never/missing	21/5/7	7/3/0	5/1/1	4/0/3	5/1/3
	Arsenic [µg/m3 years]	188	189	188	159	234
	Radon [WLM]	173	63	151	193	182
	Quartz [mg/m3 years]	11.7	13.5	9.7	11.2	11.7
Rn low As low(N = 37)	N	36	9	8	9	10
	Age [years] (median, range)	67, 50–87	75, 50–87	62, 51–73	67, 58–79	71, 52–82
	Miners with silicosis	6	4	0	0	2
	Smoking ever/never/missing	27/0/9	5/0/4	6/0/2	7/0/2	9/0/1
	Arsenic [µg/m3 years]	0	0	0	0	0
	Radon [WLM]	54	255	91	58	21
	Quartz [mg/m3 years]	5.0	4.8	9.8	5.3	4.9
Total	N	146	39	35	33	39
	Age [years] (median, range)	66, 48–87	72, 48–87	63, 51–81	67, 55–82	65, 52–86
	Miners with silicosis	65	25	15	11	14
	Smoking ever/never/missing	111/8/27	28/4/7	27/3/5	26/0/7	30/1/8
	Arsenic [µg/m3 years]	75.5	109.2	44.5	104.6	48.0
	Radon [WLM]	1044	1042	1189	1075	1022
	Quartz [mg/m3 years]	16.3	17.7	17.3	18.2	13.8