Table 1

Baseline characteristics of subjects in random subcohort and analysis cohort in the HUNT2 study, 1995–1997

Subcohort
(n=6613)
Analysis cohort
(n=6377)
Age (years)
 <655028 (76.0%)4878 (76.5%)
 ≥651585 (24.0%)1499 (23.5%)
Sex
 Female3493 (52.8%)3395 (53.2%)
 Male3120 (47.2%)2982 (46.8%)
Season of blood draw
 Spring1523 (23.0%)1474 (23.1%)
 Summer828 (12.5%)800 (12.5%)
 Fall2303 (34.8%)2225 (34.9%)
 Winter1959 (29.6%)1878 (29.4%)
Body mass index (kg/m2)
 Normal/underweight (<25.0)2637 (39.9%)2558 (40.1%)
 Overweight (25.0–29.9)2822 (42.7%)2744 (43.0%)
 Obese (≥30.0)1064 (16.1%)1022 (16.0%)
 Unknown90 (1.4%)53 (0.8%)
Daily smoker
 Never2798 (42.3%)2720 (42.7%)
 Former1752 (26.5%)1688 (26.5%)
 Current1896 (28.7%)1822 (28.6%)
 Unknown167 (2.5%)147 (2.3%)
Alcohol consumption (times per month)
 Never2295 (34.7%)2190 (34.3%)
 1–43010 (45.5%)2937 (46.1%)
 ≥5726 (11.0%)704 (11.0%)
 Unknown582 (8.8%)546 (8.6%)
Physical activity
 Inactive or very low1419 (21.5%)1367 (21.4%)
 Low1155 (17.5%)1121 (17.6%)
 Moderate1424 (21.5%)1378 (21.6%)
 High557 (8.4%)544 (8.5%)
 Unknown2058 (31.1%)1967 (30.8%)
Education (years)
 <102271 (34.3%)2180 (34.2%)
 10–122150 (32.5%)2085 (32.7%)
 ≥131824 (27.6%)1774 (27.8%)
 Unknown368 (5.6%)338 (5.3%)
Economic difficulties
 No3197 (48.3%)3125 (49.0%)
 Yes1351 (20.4%)1304 (20.4%)
 Unknown2065 (31.2%)1948 (30.5%)
Chronic illness (first definition)
 No5418 (81.9%)5256 (82.4%)
 Yes906 (13.7%)856 (13.4%)
 Unknown289 (4.4%)265 (4.2%)
Chronic illness (second definition)
 No4115 (62.2%)4007 (62.8%)
 Yes2228 (33.7%)2125 (33.3%)
 Unknown270 (4.1%)245 (3.8%)
  • Data are given as number of subjects (percentage).

  • HUNT2, the Nord-Trøndelag Health Study 2.