Table 2.

Descriptive characteristics of the cohort of Newfoundland fluorspar miners with mortality follow-up from 1950 to 2016

Characteristics	Number of miners	%
Surface miner (exclusively)	315	15.3
Underground miner	1735	84.7
Age at first exposure < 20 year	375	18.2
Age at first exposure 20–24 year	535	26.0
Age at first exposure 25–29 year	290	14.1
Age at first exposure 30–39 year	320	15.6
Age at first exposure 40 + year	215	10.5
Birth year
Before 1900	175	8.5
1900–1909	170	8.3
1910–1919	390	19.0
1920–1939	420	20.4
1940–1949	340	16.5
1950–1959	475	23.1
Death year
1935–1949	25	1.2
1950–1959	90	4.4
1960–1969	185	9.0
1970–1979	230	11.2
1980–1989	230	11.2
1990–1999	240	11.7
2000–2009	330	16.1
2010–2016	135	6.7
Alive at end of follow-up	690	33.6
First employment
1933–1939	285	13.9
1940–1944	590	28.6
1945–1949	115	5.6
1950–1954	190	9.3
1955–1959	80	4.0
1960–1964	240	11.6
1965–1969	375	18.2
1970–1976	180	8.8
Lifetime smoking status
Never	160	14.5
Ever	940	85.5
Unknown	955
Cigarettes smoked daily
Never smoker	160	7.8
< 10	45	2.2
10–19	270	13.1
20–29	420	20.4
30–39	120	5.9
40 +	65	3.2
Unknown	970	47.2

The number of miners were rounded to the base unit of 5 as per Statistics Canada’s rules of disclosure governing the use of files linked to national mortality data