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Table 4 Mortality rates and hazard ratio for all-cause mortality between categories of body mass index in the Tromsø study 1986-2008 until end of follow up on December 31, 2015

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

  Person Time (Years) Died Mortality rate Hazard ratio a 95% CI
Body mass index
  < 18.5 Kg/m2 5121 109 0.021 1.69 (1.38- 2.06)
 18.5-22.99 Kg/m2 129,676 1122 0.009 1.14 (1.05- 1.25)
 23-24.99 kg/m2 (ref) 107,253 1026 0.010 1.00 Reference
 25-29.99 kg/m2 169,612 2160 0.013 0.97 (0.90- 1.05)
  > 30 kg/m2 46,709 855 0.018 1.12 (1.02- 1.23)
Self-Reported Health
 Poor 10,762 416 0.039 2.54 (1.88- 3.45)
 Not so good 117,369 2581 0.022 1.94 (1.55- 2.43)
 Good 259,293 2045 0.008 1.30 (1.10- 1.54)
 Very good (ref) 70,947 230 0.003 1.00 Reference
Time varying covariates
 Self-Reported Health     0.004 (1.00- 1.02)
  1. aHazard ratios (HR) are based on Cox proportional hazard and includes both SRH and BMI controlled for age, gender, comorbidity, mental health symptoms, systolic blood pressure, cholesterol, physical activity levels and daily smoking. For HRs shown in Table 4, is SRH time-varying but BMI time-invariant