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Table 1 Characteristics of all participants for BMI groups for each wave

From: What is the impact of underweight on self-reported health trajectories and mortality rates: a cohort study

  Panel <18.5 18.5-22.99 23-24.99 25-29.99 >30 P-value c
   Kg/m2 Kg/m2 Kg/m2 kg/m2 kg/m2  
Frequency Tromsø 3 299 7075 4588 5226 945  
Tromsø 4 327 6958 5789 9391 2730  
Tromsø 5 86 1378 1534 3392 1484  
Tromsø 6 80 1996 2175 5355 2454  
SRH (% reporting good/very good) Tromsø 3 75.4% 82.0% 82.4% 76.9% 68.3% <0.001
Tromsø 4 54.8% 74.5% 74.1% 68.7% 54.9% <0.001
Tromsø 5 41.3% 64.6% 68.5% 64.4% 54.0% <0.001
Tromsø 6 46.6% 70.2% 71.9% 67.0% 53.9% <0.001
Age (Mean)a Tromsø 3 35.3 37.2 40.0 42.5 43.1 <0.001
Tromsø 4 49.5 44.1 46.7 50.1 53.2 <0.001
Tromsø 5 64.5 56.7 58.5 60.7 61.9 <0.001
Tromsø 6 63.4 56.5 57.4 59.0 59.1 <0.001
Gender (% male) Tromsø 3 17.5% 35.6% 58.6% 67.5% 50.8% <0.001
Tromsø 4 22.3% 33.5% 51.5% 58.3% 42.3% <0.001
Tromsø 5 15.0% 31.1% 43.2% 50.6% 39.8% <0.001
Tromsø 6 23.3% 29.5% 46.4% 54.1% 47.2% <0.001
Comorbidity (mean HII)b Tromsø 3 0.54 0.43 0.44 0.54 0.70 <0.001
Tromsø 4 1.26 0.78 0.82 1.04 1.39 <0.001
Tromsø 5 2.50 1.54 1.38 1.67 2.27 <0.001
Tromsø 6 2.53 1.44 1.40 1.57 2.11 <0.001
Mental distress (mean MHI/HSCL)b Tromsø 3 . . . . .  
Tromsø 4 1.66 1.54 1.51 1.50 1.54 <0.001
Tromsø 5 1.32 1.30 1.24 1.22 1.25 <0.001
Tromsø 6 1.43 1.31 1.28 1.27 1.31 <0.001
Resting heart rate (mean BPM)b Tromsø 3 80.7 75.2 73.0 73.8 78.0 <0.001
Tromsø 4 76.9 72.8 71.2 72.1 75.8 <0.001
Tromsø 5 75.4 71.1 69.3 69.6 72.7 <0.001
Tromsø 6 70.3 64.7 63.5 64.7 67.6 <0.001
Systolic blood pressure (mean mmHG) Tromsø 3 120.3 123.4 128.1 133.4 138.1 <0.001
Tromsø 4 129.5 127.5 133.1 139.4 148.2 <0.001
Tromsø 5 137.3 132.4 135.7 140.6 144.6 <0.001
Tromsø 6 132.3 129.0 132.3 138.3 142.1 <0.001
Total cholesterol (mean) Tromsø 3 5.25 5.45 5.89 6.26 6.48 <0.001
Tromsø 4 5.72 5.65 5.99 6.35 6.59 <0.001
Tromsø 5 5.91 5.90 6.07 6.26 6.31 <0.001
Tromsø 6 5.53 5.45 5.59 5.69 5.61 <0.001
Physical activity (% inactive) Tromsø 3 8.4% 10.8% 10.0% 11.0% 9.2% 0.255
Tromsø 4 64.3% 46.6% 45.1% 50.8% 62.7% <0.001
Tromsø 5 48.5% 29.6% 30.8% 32.7% 37.5% <0.001
Tromsø 6 31.7% 15.2% 17.1% 18.9% 30.3% <0.001
Smoking habits (% daily smokers) Tromsø 3 64.3% 50.4% 43.1% 41.0% 35.0% <0.001
Tromsø 4 59.7% 44.4% 36.4% 31.3% 26.7% <0.001
Tromsø 5 67.5% 41.2% 30.6% 24.7% 18.3% <0.001
Tromsø 6 37.5% 26.3% 22.3% 17.7% 15.9% 0.003
  1. aTromsø 3 and 4 did not include subjects <25 years, Tromsø 5 &6 did not include subjects <30 years
  2. b HII Health impact index which measures comorbidity, MHI Mental health index (Tromsø 4), HSCL Hopkins symptoms checklist (Tromsø 5-6), BPM beats per minute
  3. cComparison of BMI groups were performed utilizing Kruskal-Wallis equality-of-populations rank test for gender, smoking habits and physical activity levels, and one-way anova for all other variables