Table 2

BMI at examinations 2 and 3 and BMI change in the overall cohort and period-specific samples. The Tromsø Study 1974-2016.

Overall cohortN=11 308Examination 2Examination 3Change
Examinations 2 and 3
BMI (kg/m2)
Mean
95% CI
24.96
24.89 to 25.03
25.80
25.73 to 25.87
0.84
0.82 to 0.89
Period-specific samples*
Tromsø 1–3 (1974–1987)†N=3570
Tromsø 2 and 3 (1979–1987)
BMI (kg/m2)
Mean
95% CI
24.65
24.56 to 24.74
25.14
25.04 to 25.24
0.49
0.44 to 0.54
Tromsø 2–4 (1979–1995)N=9679
Tromsø 3 and 4 (1986–1995)
BMI (kg/m2)
Mean
95% CI
24.25
24.18 to 24.32
25.38
25.31 to 25.45
1.13
1.09 to 1.17
Tromsø 3–5 (1986–2001)N=3827
Tromsø 4 and 5 (1994–2001)
BMI (kg/m2)
Mean
95% CI
25.53
25.42 to 25.64
26.49
26.36 to 26.62
0.95
0.90 to 1.01
Tromsø 4–6 (1994–2008)N=2212
Tromsø 5 and 6 (2001–2008)
BMI (kg/m2)
Mean
95% CI
26.66
26.50 to 26.82
26.78
26.61 to 26.95
0.12
0.04 to 0.20
Tromsø 5–7 (2001–2016)n=1146
Tromsø 6 and 7 (2007–2016)
BMI (kg/m2)
Mean
95% CI
27.01
26.76 to 27.26
27.22
26.96 to 27.48
0.21
0.09 to 0.33
  • Data are shown as unadjusted mean and 95% CI. Examination 2 refers to the second survey of the three attended surveys; examination 3 refers to the third survey of the three attended surveys.

  • *Period-specific samples include all participants meeting our inclusion criteria for that period (ie, these samples do not add up to the overall cohort (Tromsø 1–7), which includes participants with their three most recent attendances).

  • †Tromsø 1 included only men.

  • BMI, body mass index.