Table 1.
Selected characteristics of the study sample by smoking status, in the Norwegian Women and Cancer Study, 1991–2015, (N = 142 508).
| Characteristics | Never | Passivea | Former | Current |
|---|---|---|---|---|
| Subjects | 18 631 (13.1%) | 25 082 (17.6%) | 52 887 (37.1%) | 45 908 (32.2%) |
| Person-years of follow-up | 303 310 | 404 765 | 797 385 | 764 512 |
|
Age at enrolment, mean (±SD) Median [min-max] |
51 (9) 51 [34–70] |
48 (8) 48 [34–70] |
50 (8) 50 [31–70] |
47 (8) 47 [31–70] |
|
Age at diagnosis, mean (±SD) Median [min-max] |
66.6 (9.3) 67 [34–88] |
63.0 (8.1) 64 [34–88] |
63.3 (8.0) 64 [31–70] |
63.0 (8.1) 63 [31–88] |
|
Years since quit smoking, mean (±SD) Median [min-max] |
NAb | NAb |
16.6 (9.8) 15.5 [1.0–51.3] |
NAb |
|
Education years, mean (±SD) Median [min-max] |
12.9 (3.8) 13 [0–45] |
13.1 (3.6) 13 [0–43] |
12.6 (3.6) 12 [0–40] |
11.5 (3.1) 11 [0–40] |
|
Physical activity (±SD) Median [min-max] |
5.7 (1.8) 6 [1–10] |
5.8 (1.9) 6 [1–10] |
5.8 (1.9) 6 [1–10] |
5.6 (2.0) 5 [1–10] |
|
BMIc, mean (±SD) Median [min-max] |
24.4 (3.9) 24 [15–64] |
24.3(4.0) 24 [13–64] |
24.6 (4.0) 24 [10–71] |
23.6 (3.8) 23 [12–72] |
|
Alcohol g/day, mean (±SD) Median [min-max] |
2.2 (3.8) 0.8 [0–203] |
3.1 (4.6) 1.7 [0–189] |
4.4 (6.1) 2.4 [0–360] |
4.4 (7.2) 2.1 [0–360] |
| Lung cancer overall | 43 | 53 | 329 | 1,082 |
| Adenocarcinomad (%) | 26 (61) | 34 (64) | 173 (52) | 459 (42) |
| Squamous cell carcinomad (%) | 1 (2) | 2 (4) | 35 (11) | 159 (15) |
| Small cell lung cancerd (%) | 2 (5) | 2 (4) | 45 (14) | 246 (23) |
| Other nsclcd,e (%) | 12 (28) | 13 (24) | 59 (18) | 138 (13) |
| Large cell carcinomad (%) | 1 (2) | 2 (4) | 8 (2) | 22 (2) |
| Excludedd,f (%) | 1 (2) | 0 (0) | 9 (3) | 58 (5) |
aPassive smokers include never smokers who lived with a smoker in their childhood and/or live with a smoker at enrolment of the study.
bNA (not applicable).
cBody mass index; weight in kilograms divided by the square of the heights in metres.
dThe percentage of each histological subtype in each column is the percentage of the subtype of lung cancer overall in that column.
eOther nsclc; not specified non small cell lung carcinoma.
fExcluded; Other or not otherwise specified carcinoma.