Table 3. Adjusted* Relationship Between Body Mass Index Category and Mortality, Including Interaction Between Body Mass Index and Diabetes
Model VariablesHR (95% CI)P
Age1.09 (1.08–1.09)<.001
Female0.54 (0.48–0.62)<.001
Race/ethnicity (reference = white)
    Hispanic0.61 (0.50–0.74)<.001
    Black1.19 (0.98–1.43).07
    Other1.04 (0.79–1.37).78
Education (reference = <high school)
    Some high school0.98 (0.83–1.17).86
    High school graduate0.85 (0.73–0.98).03
    Some college0.77 (0.63–0.95).01
    College graduate0.66 (0.54–0.82)<.001
Income, % FPL (reference = <100% FPL)
    100-<1251.02 (0.76–1.36).89
    125-<2000.98 (0.80–1.20).82
    200-<4000.89 (0.74–1.06).19
    ≥4000.78 (0.63–0.96).02
Health insurance (reference = private)
    Public1.27 (1.09–1.47).002
    None1.12 (0.80–1.56).51
Urban residence0.89 (0.78–1.02).09
Census region (reference = Northeast)
    Midwest0.99 (0.83–1.18).90
    South1.18 (1.02–1.38).03
    West1.13 (0.95–1.34).16
Smoker1.74 (1.51–1.99)<.001
Diabetes2.60 (2.00–3.38)<.001
BMI category, kg/m2 (reference = 20-<25 kg/m2)
    <202.00 (1.59–2.50)<.001
    25-<300.80 (0.68–0.95).01
    30-<350.97 (0.78–1.19).76
    ≥351.27 (0.96–1.69).10
Diabetes (present)*BMI interaction, kg/m2
    <200.58 (0.24–1.40).22
    25-<300.73 (0.50–1.08).11
    30-<350.54 (0.36–0.81).003
    ≥350.53 (0.34–0.83).006
  • * Analyses also adjusted for Medical Expenditure Panel Survey response year.

  • BMI, body mass index; CI, confidence interval; FPL, Federal Poverty Level; HR, hazard ratio.