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Table 2 Participation in five previous Tromsø Studies, 1974 to 2001

From: Sleep disturbances in an arctic population: The Tromsø Study

    No. invited No. attending Attendance (%)
Study Year Year of birth Men Women Men Women Men Women
Tromsø I 1974 1927–1956 8 867   6 595   83  
Tromsø II 1979–1980 1925–19591 11 481 9 959 8 477 8 144 73.8 81.8
Tromsø III 1986–1987 1925–19661 14 539 12 877 10 413 10 189 71.6 79.1
Tromsø IV 1994–1995 <1970 18 480 19 078 12 865 14 293 69.6 74.9
Tromsø V 2001 <19722 4 636 5 717 3 511 4 619 75.7 80.8
  1. 1From 1930 onward for women. 2Full birth cohorts were not included. See text for description.