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Table 1 Selected characteristics of the study population at enrollment, stratified by cohort, among 602,242 Norwegian men and women (1972–2003)

From: Smoking increases rectal cancer risk to the same extent in women as in men: results from a Norwegian cohort study

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

  1. SD standard deviation, Range interquartile range. aIncluded only men. bNot at enrollment. cHeavy physical activity: Light sports or heavy gardening ≥ 4 hours per week, heavy exercise or daily competitive sports.