Table 1 Baseline characteristics according to BMI categories in the HUNT2 Study, 1995–1997 (N = 62,453)
| Â | BMI (kg/m2) | ||
|---|---|---|---|
Variables |  < 25.0 | 25.0–29.9 |  ≥ 30.0 |
Number of subjects | 25,056 | 27,115 | 10,282 |
Age (years) | 45.5 ± 17.0 | 51.4 ± 16.4 | 54.1 ± 16.3 |
Number of lung cancer cases (%) | 435 (43.1) | 426 (42.2) | 148 (14.7) |
Sex, % (women/men) | 58.8/41.2 | 45.2/54.8 | 58.7/41.3 |
Smoking, % (never/current/former/unknown) | 42.3/34.8/21.0/2.0 | 42.0/25.8/30.3/2.0 | 44.4/22.2/30.9/2.5 |
Passive smoking, % (never/ever/unknown) | 19.2/79.2/1.5 | 17.8/80.3/1.9 | 16.8/80.9/2.3 |
Alcohol consumption (times/month), % (never/ ≥ 1/unknown) | 30.8/61.4/7.9 | 33.7/57.5/8.9 | 45.2/45.2/9.6 |
Leisure physical activity, % (inactivea/activeb/unknown) | 19.7/53.2/27.1 | 21.3/47.6/31.2 | 26.6/37.1/36.3 |
Total sitting time daily (hours), % (< 8/ ≥ 8/unknown) | 49.1/28.4/22.5 | 49.2/28.2/22.6 | 46.8/27.3/25.9 |
Occupational activity (Most sedentary/much walking or lifting/heavy physical work/unknown) | 23.1/46.9/8.9/21.1 | 23.1/41.1/10.9/24.9 | 21.4/36.7/9.0/32.9 |
Education (years), % (< 10/ ≥ 10/unknown) | 27.7/68.3/4.0 | 35.9/59.1/5.0 | 44.8/47.7/7.5 |
Economic difficulties, % (no/yes/unknown) | 50.4/22.5/27.1 | 48.9/20.4/30.7 | 41.8/23.3/34.9 |
Family history of cancer, % (no/yes) | 77.4/22.6 | 73.1/27.0 | 71.9/28.1 |
COPDc, % (no/yes) | 98.1/1.9 | 97.8/2.2 | 96.9/3.1 |
Asthma, % (no/non–active/active/unknown) | 95.0/1.8/3.2/0.1 | 94.7/1.7/3.6/0.1 | 92.6/2.0/5.4/0.1 |