Table 1

Birth year of participants, year of examination, number of participants and participation per cent by gender (the Tromsø Study 1974–2004)

Study	Year of screening	Gender	Birth year	Participants, N (%)
Tromsø 1	1974–1975	Men	1925–1954	6595 (83)
Tromsø 2	1979–1980	Men	1925–1959	8477 (82)
Tromsø 2	1979–1980	Women	1929–1959	8143 (88)
Tromsø 3	1986–1987	Men	1922–1974	10963 (78)
Tromsø 3	1986–1987	Women	1920–1974	10863 (85)
Tromsø 4	1994–1995	Men	1897–1969	12865 (74)
Tromsø 4	1994–1995	Women	1897–1969	14293 (79)
Tromsø 5	2001	Men	1912–1971	3511 (76)
Tromsø 5	2001	Women	1912–1971	4619 (81)

The numbers provided in parentheses refer to eligible population.