Fig. 1
Mortality rates in each BMI group among all patients (a), patients below 60 years (b), patients between 60 and 69 years (c), and patients aged 70 or above (d). Error bars represent 95% confidence intervals. The depicted mortality rates are unadjusted mortality rates. Underweight is defined as BMI below 18.5 kg/m2, normal weight is defined as BMI between 18.5 and 23.99 kg/m2, overweight is defined as BMI between 24 and 27.99 kg/m2, and obese is defined as BMI ≥ 28 kg/m2. *p < 0.05, **p < 0.01, ***p < 0.001