Table 1.

Clinical studies used for the SMR meta-analysis

Ref.	Country	Work type	Working period	Mortality follow-up	Subgroup
[20]	France	Uranium metallurgic research	1950–1968	1968–1990
[21]	Britain	Nuclear weapons research	1951–1982	Same	Internal uranium exposition
[22]	USA	Uranium milling and refining	1979–2001	1979–2005	Never worked in underground mines
[23]	USA	Nuclear fuel research (mainly uranium)	1948–1999	1948–2008	Any internal radiation
[24]	USA	Uranium enrichment	1952–2003	Same
[25]	USA	Uranium milling, refining and research	1943–1949	1943–1979	Mortality rates are compared with surrounding districts if possible; if not, they are compared with home country rates
[26]	USA	Uranium milling, refining and metallurgy	1942–1966	1942–1993
[27]	France	Uranium refining and enrichment	1960–2005	1968–2005
[28]	USA	Uranium metallurgy	1956–1978	1956–1979	Industrial worker
[29]	Germany	Uranium milling and refining	1946–1989	1970–2008
[30]	USA	Uranium enrichment and metallurgy	1947–1974	1947–1990
[31]	Britain	Uranium enrichment	1946–1995	Same	Radiation workers
[32]	Britain	Uranium refining and nuclear fuel production	1946–1995	Same	Radiation worker
[33]	USA	Uranium enrichment	1955–1991	Same	Internal radiation exposure was preferred, missing cancer types are refilled with the uranium enrichment subgroup
[34]	USA	Uranium milling and refining	1940/1960–1998	Same	Mortality rates are compared with surrounding districts if possible; if not, they are compared with home country rates
[8]	USA	Uranium enrichment and metallurgy	1943–1947	1943–1973	Alpha and beta chemistry
[35]	USA	Uranium enrichment	1951–1985	1951–2004	Hourly paid male worker
[36]	USA	Uranium milling and phosphate fertilizer production	1953–1976	Same
[37]	Canada	Uranium milling, refining and enrichment	1932–1980	1950–1999