BMI change by occupational physical activity change for the overall cohort and in strata of sex, birth year, smoking, education and leisure-time physical activity change. The Tromsø Study 1974-2016.
| Tromsø 1–7 | Change occupational physical activity examinations 1 and 2 | |||||
| (1974–2016) | Total | Persistently Inactive | Persistently Active | Active to Inactive | Inactive to Active | Pequality |
| BMI change examinations 2 and 3 | ||||||
| Total (N) | 11 308 | 3692 | 5560 | 741 | 1315 | |
| BMI (kg/m2) | Mean 95% CI | 0.81 0.75 to 0.87 | 0.87 0.82 to 0.92 | 0.81 0.67 to 0.94 | 0.91 0.81 to 1.01 | 0.25 |
| Sex | ||||||
| Women (n) | 5482 | 1638 | 2925 | 319 | 600 | |
| BMI (kg/m2) | Mean 95% CI | 1.06 0.96 to 1.17 | 1.09 1.02 to 1.17 | 1.10 0.87 to 1.33 | 1.18 1.01 to 1.34 | 0.74 |
| Men (n) | 5826 | 2054 | 2635 | 422 | 715 | |
| BMI (kg/m2) | Mean 95% CI | 0.56 0.49 to 0.63 | 0.67 0.61 to 0.74 | 0.55 0.39 to 0.71 | 0.66 0.54 to 0.78 | 0.11 |
| Birth year | ||||||
| ≤1929 (n) | 748 | 239 | 350 | 60 | 99 | |
| BMI (kg/m2) | Mean 95% CI | 0.09 0.31 to 0.14 | 0.15 −0.03 to 0.33 | 0.20 −0.22 to 0.62 | 0.31 0.64 to 0.01 | 0.054 |
| 1930–1939 (n) | 2974 | 856 | 1580 | 189 | 349 | |
| BMI (kg/m2) | Mean 95% CI | 0.43 0.30 to 0.57 | 0.53 0.43 to 0.62 | 0.55 0.28 to 0.82 | 0.36 0.16 to 0.56 | 0.39 |
| 1940–1949 (n) | 4192 | 1483 | 2020 | 260 | 429 | |
| BMI (kg/m2) | Mean 95% CI | 0.85 0.75 to 0.95 | 0.92 0.84 to 1.00 | 0.73 0.50 to 0.96 | 1.06 0.88 to 1.24 | 0.10 |
| 1950–1959 (n) | 3947 | 932 | 1430 | 205 | 380 | |
| BMI (kg/m2) | Mean 95% CI | 1.34 1.22 to 1.45 | 1.28 1.19 to 1.37 | 1.28 1.04 to 1.52 | 1.52 1.34 to 1.70 | 0.12 |
| ≥1960 (n) | 447 | 182 | 180 | 27 | 58 | |
| BMI (kg/m2) | Mean 95% CI | 1.04 0.69 to 1.39 | 1.11 0.75 to 1.46 | 1.13 0.24 to 2.02 | 1.34 0.72 to 1.95 | 0.88 |
| Smoking | ||||||
| Current smoker (n) | 4480 | 1250 | 2343 | 306 | 581 | |
| BMI (kg/m2) | Mean 95% CI | 0.96 0.85 to 1.07 | 1.00 0.92 to 1.08 | 0.82 0.60 to 1.03 | 1.02 0.86 to 1.17 | 0.44 |
| Previous smoker (n) | 1790 | 703 | 782 | 126 | 179 | |
| BMI (kg/m2) | Mean 95% CI | 0.34 0.19 to 0.48 | 0.42 0.28 to 0.55 | 0.52 0.19 to 0.85 | 0.43 0.16 to 0.71 | 0.71 |
| Never smoker (n) | 5038 | 1739 | 2435 | 309 | 555 | |
| BMI (kg/m2) | Mean 95% CI | 0.87 0.78 to 0.95 | 0.91 0.83 to 0.98 | 0.91 0.71 to 1.10 | 0.95 0.81 to 1.10 | 0.79 |
| Education | ||||||
| Primary school (n) | 4698 | 878 | 3010 | 265 | 545 | |
| BMI (kg/m2) | Mean 95% CI | 0.75 0.62 to 0.88 | 0.83 0.76 to 0.90 | 0.68 0.45 to 0.92 | 0.79 0.63 to 0.95 | 0.52 |
| High school (n) | 3610 | 1361 | 1566 | 271 | 412 | |
| BMI (kg/m2) | Mean 95% CI | 0.87 0.77 to 0.97 | 0.95 0.86 to 1.04 | 0.82 0.60 to 1.03 | 1.11 0.93 to 1.29 | 0.09 |
| University<4 years (n) | 1641 | 787 | 539 | 117 | 198 | |
| BMI (kg/m2) | Mean 95% CI | 0.85 0.72 to 0.98 | 0.90 0.75 to 1.06 | 0.88 0.55 to 1.21 | 0.97 0.71 to 1.22 | 0.85 |
| University>4 years (n) | 1359 | 666 | 445 | 88 | 160 | |
| BMI (kg/m2) | Mean 95% CI | 0.72 0.59 to 0.85 | 0.80 0.64 to 0.96 | 1.16 0.81 to 1.50 | 0.75 0.49 to 1.01 | 0.14 |
| Leisure time physical activity change examinations 1 and 2* | ||||||
| Persistently Inactive (n) | 813 | 332 | 317 | 63 | 101 | |
| BMI (kg/m2) | Mean 95% CI | 0.81 0.60 to 1.03 | 0.98 0.76 to 1.20 | 1.25 0.76 to 1.73 | 0.94 0.55 to 1.33 | 0.42 |
| Persistently Active (n) | 5368 | 1599 | 2798 | 328 | 643 | |
| BMI (kg/m2) | Mean 95% CI | 1.00 0.91 to 1.08 | 1.02 0.95 to 1.08 | 0.82 0.63 to 1.02 | 1.13 1.00 to 1.27 | 0.08 |
| Active to Inactive (n) | 974 | 291 | 469 | 71 | 143 | |
| BMI (kg/m2) | Mean 95% CI | 0.82 0.60 to 1.04 | 1.03 0.86 to 1.21 | 1.24 0.80 to 1.68 | 1.11 0.80 to 1.42 | 0.23 |
| Inactive to Active (n) | 999 | 348 | 451 | 66 | 134 | |
| BMI (kg/m2) | Mean 95% CI | 0.90 0.69 to 1.11 | 1.09 0.91 to 1.28 | 0.89 0.42 to 1.37 | 0.77 0.43 to 1.10 | 0.31 |
Data are adjusted for sex, birth year, smoking, education and BMI at examination 2, and are shown as adjusted mean and 95% CI. Examination 1 refers to the first survey of the three attended surveys; examination 2 refers to the second survey of the three attended surveys; examination 3 refers to the third survey of the three attended surveys. Pequality is the main difference between groups.
*The leisure-time Saltin-Grimby Physcial Activity Scale was not included in Tromsø 4 (1994–1995).
BMI, body mass index.