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Table 1 Characteristics of the study population by education, the Norwegian Health Screening Surveys, 1974–2003, (N = 595,675)

From: Smoking related lung cancer mortality by education and sex in Norway

CharacteristicsEducation in years
< 1010–12≥13All
MenWomenMenWomenMenWomenMenWomen
Subjects (%)64,024
(22)
76,455
(25)
155,905
(55)
169,949
(55)
66,332
(23)
63,010
(20)
286,261
(48)
309,414
(52)
Lung cancer casesa, n (%)1646
(44)
1338
(47)
1759
(46)
1297
(45)
385
(10)
238
(8)
37902873
Lung cancer deaths, n (%)1517
(46)
1138
(48)
1473
(44)
1056
(44)
333
(10)
185
(8)
33232379
Person-years of follow up1,365,6881,666,4463,106,8503,429,8051,314,4431,224,2795,786,9816,320,530
Body mass index (mean, SD)26 (3)25 (4)26 (3)25 (4)25 (3)24 (4)26 (3)25 (4)
Heavy physical activityb (%)2814362241283520
Never smokers (%)2033323850573341
Former smokers (%)2718272226232721
Current smokers (%)5349414024204038
Duration of smokingc, years, median (interquartile range)22
(15–26)
20
(15–25)
20
(13–25)
19
(10–23)
18
(10–22)
15
(8–20)
20
(13–25)
20
(10–23)
Cigarettes smoked per dayc, median (interquartile range)15
(10–20)
10
(8–15)
15
(10–20)
10
(7–15)
12
(10–20)
10
(5–15)
15
(10–20)
10
(7–15)
Pack-yearsc, median (interquartile range)14
(8–21)
10
(5–16)
13
(7–20)
9
(4–15)
10
(5–18)
6
(3–12)
13
(7–20)
9
(4–15)
Age at enrollment, median (interquartile range)42
(40–45)
42
(41–45)
41
(40–42)
41
(40–42)
42
(41–43)
41
(40–42)
41
(40–42)
41
(40–43)
Age at lung cancer death, never smokers, median (interquartile range)75
(62–80)
77
(68–84)
62
(52–73)
64
(57–76)
57
(55–69)
61
(55–66)
63
(54–76)
66
(59–80)
Age at lung cancer death, current smokers, median (interquartile range)66
(60–74)
63
(57–71)
63
(57–70)
60
(55–66)
64
(58–70)
61
(56–68)
64
(58–72)
62
(56–69)
  1. aAt enrollment
  2. bHeavy physical activity: light sports or heavy gardening ≥4 h/week, heavy exercise or daily competitive sports
  3. cDuration of smoking, cigarettes smoked per day and pack-years in ever smokers