Table 1.

Characteristics of the historic Czech, French, and Canadian (Beaverlodge) cohorts of uranium miners

Cohort	Type of worker	Mine location	Time period of employment	Inclusion criteria	Person-years at risk
Czech (Tomasek et al. 2008)	Underground miners	Jáchymov region of West Bohemia	1948–1959	Employed at least 4 years	From the earliest year of follow-up plus 4 years until the end of follow-up
		Příbram district of Central Bohemia	1968–1988	Employed at least 1 year	From the earliest year of follow-up plus 1 year until the end of follow-up
French (Vacquier et al. 2009)	Underground and open pit miners	Four main mining areas in France: Vendée, Limousin, Forez and Hérault	1946–1999	Employed at least 1 year	From the earliest year of follow-up plus 1 year until the end of follow-up
Beaverlodge, Canada (Lane et al. 2010)	Underground miners and mill workers	Near town of Eldorado in Northern Saskatchewan	1948–June 1982 Workers employed in 1982 had exposure follow-up to 1999	Employed some time from 1948  to  1980, were aged 15–75 years when employed, and known to be alive in 1950 at the start of the mortality follow-up	From the date of the first day of employment until the end of follow-up