Table 1 Characteristics of the study population, by BMI assessment type and by BMI category
| Â | Measured BMI | Self-reported BMI | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Â | Body mass index category (kg/m2) | Body mass index category (kg/m2) | ||||||||
|  | <18.5 | 18.5- <25 | 25- <30 | ≥30 | Missings (n) | <18.5 | 18.5- <25 | 25- <30 | ≥30 | Missings (n) |
Participants (n) | 348 | 8647 | 5951 | 1805 | Â | 597 | 9274 | 4050 | 906 | Â |
Participants (in % of total n, by BMI assessment type) | 2.1 | 51.6 | 35.5 | 10.8 | Â | 4.0 | 62.5 | 27.3 | 6.1 | Â |
Women (%) | 87.9 | 59.7 | 38.0 | 47.3 | Â | 91.1 | 58.8 | 35.7 | 47.7 | Â |
Mean BMI (kg/m2) | 17.7 | 22.3 | 27.1 | 32.8 | Â | 17.6 | 22.1 | 26.9 | 33.0 | Â |
Mean follow-up time (years) | 23.3 | 22.3 | 20.2 | 18.8 | Â | 16.9 | 17.1 | 16.7 | 15.9 | Â |
Mean age (years) | 41.0 | 43.4 | 48.8 | 52.1 | Â | 40.4 | 44.1 | 49.9 | 52.1 | Â |
Mortality | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â |
 All-cause |  |  |  |  |  |  |  |  |  |  |
 Deaths§ (n) | 57 | 1526 | 1516 | 615 |  | 73 | 1173 | 851 | 243 |  |
 Person-years (py) | 8096 | 192739 | 120456 | 33840 |  | 10055 | 158996 | 67575 | 14468 |  |
 Age-standardized rate (per 100000 py) | 909 | 800 | 915 | 1117 |  | 1059 | 799 | 924 | 1090 |  |
 Cardiovascular diseases (CVD) |  |  |  |  |  |  |  |  |  |  |
 Deaths (n) | 16 | 468 | 529 | 251 |  | 18 | 407 | 307 | 96 |  |
 Deaths (in % of all-cause deaths) | 28.1 | 30.7 | 34.9 | 40.8 |  | 24.7 | 34.7 | 36.1 | 39.5 |  |
 Age-standardized rate (per 100000 py) | 282 | 269 | 321 | 464 |  | 342 | 294 | 332 | 437 |  |
 Cancer |  |  |  |  |  |  |  |  |  |  |
 Deaths (n) | 17 | 567 | 542 | 205 |  | 27 | 427 | 293 | 73 |  |
 Deaths (in % of all-cause deaths) | 29.8 | 37.2 | 35.8 | 33.3 |  | 37.0 | 36.4 | 34.4 | 30.0 |  |
 Age-standardized rate (per 100000 py) | 230 | 263 | 299 | 359 |  | 386 | 264 | 301 | 321 |  |
 Respiratory diseases |  |  |  |  |  |  |  |  |  |  |
 Deaths (n) | 3 | 91 | 77 | 28 |  | 2 | 69 | 49 | 20 |  |
 Deaths (in % of all-cause deaths) | 5.3 | 6.0 | 5.1 | 4.6 |  | 2.7 | 5.9 | 5.8 | 8.2 |  |
 Age-standardized rate (per 100000 py) | 54 | 51 | 48 | 52 |  | 29 | 50 | 50 | 90 |  |
 External causes |  |  |  |  |  |  |  |  |  |  |
 Deaths (n) | 10 | 121 | 92 | 30 |  | 10 | 68 | 39 | 6 |  |
 Deaths (in % of all-cause deaths) | 17.5 | 7.9 | 6.1 | 4.9 |  | 13.7 | 5.8 | 4.6 | 2.5 |  |
 Age-standardized rate (per 100000 py) | 174 | 63 | 75 | 58 |  | 109 | 48 | 49 | 34 |  |
 Other |  |  |  |  |  |  |  |  |  |  |
 Deaths (n) | 11 | 265 | 265 | 98 |  | 16 | 198 | 157 | 48 |  |
 Deaths (in % of all-cause deaths) | 19.3 | 17.4 | 17.5 | 15.9 |  | 21.9 | 16.9 | 18.5 | 19.8 |  |
 Age-standardized rate (per 100000 py) | 169 | 148 | 166 | 177 |  | 192 | 140 | 185 | 209 |  |
Covariates | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â |
 Smoking status° |  |  |  |  | 31 |  |  |  |  | 19 |
 Never smokers (%) | 54.5 | 47.7 | 45.1 | 51.7 |  | 46.1 | 46.6 | 40.7 | 44.5 |  |
 Former smokers (%) | 9.5 | 14.5 | 20.6 | 21.2 |  | 13.1 | 19.4 | 25.8 | 27.1 |  |
 Current light smokers (%) | 21.0 | 21.7 | 18.4 | 15.0 |  | 25.3 | 20.3 | 18.6 | 14.8 |  |
 Current heavy smokers (%) | 15.0 | 16.1 | 15.9 | 12.1 |  | 15.4 | 13.7 | 14.9 | 13.6 |  |
 Healthy eating* (%) | 77.3 | 71.6 | 68.7 | 66.3 | 23 | 68.3 | 67.1 | 64.9 | 65.6 | 368 |
 Sport |  |  |  |  | 334 |  |  |  |  | 458 |
 Daily (%) | 6.7 | 6.3 | 5.3 | 3.2 |  | 6.7 | 6.5 | 6.7 | 7.1 |  |
 Several times per week (%) | 11.1 | 17.6 | 14.8 | 8.6 |  | 26.1 | 30.2 | 25.5 | 20.1 |  |
 Once per week (%) | 24.4 | 24.8 | 20.7 | 13.7 |  | 22.6 | 23.6 | 20.0 | 16.7 |  |
 Less than once per week (%) | 57.9 | 51.3 | 59.2 | 74.6 |  | 44.6 | 39.7 | 47.8 | 56.1 |  |
 Education |  |  |  |  | 29 |  |  |  |  | 185 |
 Tertiary (%) | 6.9 | 6.8 | 5.0 | 3.9 |  | 9.6 | 8.2 | 6.0 | 3.8 |  |
 Upper secondary (%) | 15.6 | 14.1 | 9.8 | 6.6 |  | 13.9 | 15.0 | 14.6 | 10.8 |  |
 Secondary (%) | 54.8 | 48.8 | 46.4 | 40.8 |  | 62.8 | 57.2 | 51.8 | 47.7 |  |
 Mandatory (%) | 22.8 | 30.3 | 38.8 | 48.7 |  | 13.7 | 19.5 | 27.6 | 37.6 |  |