Characteristics | Oslo study Ia(1972–1973) | Norwegian counties study (1974–1987) | 40 years cohort (1985–1999) | CONOR (Cohort of Norway) (1994–2003) | All (1974–2003) | ||||
---|---|---|---|---|---|---|---|---|---|
Men | Men | Women | Men | Women | Men | Women | Men | Women | |
Subjects | 16,946 | 41,913 | 41,573 | 185,037 | 199,730 | 55,480 | 61,563 | 299,376 | 302,866 |
Person- years of follow-up | 476,518 | 1, 058, 699 | 1,079, 213 | 2,424,435 | 2,595, 800 | 462,398 | 516,186 | 4,422, 049 | 4,191,200 |
Age at enrollment, mean, SD | 45 ± 6 | 40 ± 7 | 40 ± 7 | 43 ± 5 | 43 ± 5 | 48 ± 14 | 48 ± 15 | 44 ± 8 | 44 ± 8 |
Age at rectal cancer diagnosis, mean, SD | 66 ± 8 | 62 ± 8 | 63 ± 8 | 57 ± 10 | 55 ± 9 | 66 ± 11 | 66 ± 14 | 62 ± 10 | 59 ± 11 |
Year of birth, median, (Range) | 1929(1925–1931) | 1938(1932–1944) | 1939(1932–1944) | 1951(1948–1954) | 1951(1948–1954) | 1954(1940–1960) | 1955(1941–1960) | 1950(1944–1954) | 1951(1946–1955) |
Number of cases | 286 | 366 | 281 | 504 | 426 | 180 | 133 | 1,336 | 840 |
Follow-up years, median, (Range) | 32(24–33) | 28(20–30) | 30(20–31) | 13(10–16) | 13(10–16) | 9(6–10) | 9(6–10) | 13(10–18) | 12(9–17) |
≥13 years of educationb, (%) | 24 | 14 | 12 | 26 | 22 | 21 | 21 | 23 | 20 |
Body mass index (BMI), mean, (kg/m2) | 25 | 25 | 24 | 26 | 24 | 26 | 25 | 26 | 25 |
Level of physical activity, heavyc (%) | 20 | 31 | 11 | 35 | 21 | 38 | 28 | 34 | 21 |
Ever smokers (%) | 79 | 74 | 54 | 66 | 61 | 62 | 56 | 67 | 59 |
Current smokers (%) | 55 | 51 | 40 | 40 | 40 | 31 | 32 | 41 | 38 |
Former smokers (%) | 24 | 23 | 14 | 26 | 21 | 31 | 24 | 26 | 21 |