## 3 Materials and Methods
### Data Preprocessing  
We investigated whether the dataset contained any null values prior to the preprocessing stage. In order to determine whether any of the data points were outliers, box plots for the features were also analyzed. Some of the features, namely hypertensive, atrial fibrillation, CHD with no MI, diabetes, deficiency anemias, depression, hyperlipidemia, renal failure, and COPD, had values of 0 and 1, which is why box plots were not generated for those features. The box plots for the rest of the features are shown in Figure 2. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**Feature** & **Mean** & **Standard Deviation** & **Min** & **25\%** & **50\%** & **75\%** & **Max** \\ \hline Age & 74.05 & 13.43 & 19.00 & 65.00 & 77.00 & 85.00 & 99.00 \\ BMI & 30.19 & 9.33 & 13.35 & 24.33 & 28.31 & 33.63 & 104.97 \\ Hypertensive & 0.72 & 0.45 & 0.00 & 0.00 & 1.00 & 1.00 \\ Atrial fibrillation & 0.45 & 0.49 & 0.00 & 0.00 & 0.00 & 1.00 \\ CHD with no MI & 0.09 & 0.28 & 0.00 & 0.00 & 0.00 & 0.00 & 1.00 \\ Diabetes & 0.42 & 0.49 & 0.00 & 0.00 & 0.00 & 1.00 & 1.00 \\ Deficiency anemias & 0.34 & 0.47 & 0.00 & 0.00 & 0.00 & 1.00 & 1.00 \\ Depression & 0.12 & 0.32 & 0.00 & 0.00 & 0.00 & 0.00 & 1.00 \\ Hyperlipidemia & 0.38 & 0.48 & 0.00 & 0.00 & 0.00 & 1.00 & 1.00 \\ Renal failure & 0.37 & 0.48 & 0.00 & 0.00 & 0.00 & 1.00 & 1.00 \\ COPD & 0.08 & 0.26 & 0.00 & 0.00 & 0.00 & 0.00 & 1.00 \\ Heart rate & 84.58 & 16.01 & 36.00 & 72.37 & 83.61 & 95.90 & 135.70 \\ Systolic BP & 118.00 & 17.37 & 75.00 & 105.38 & 116.15 & 128.63 & 203.00 \\ Diastolic BP & 1161.00 & 10.68 & 24.73 & 52.17 & 58.46 & 65.46 & 107.00 \\ Respiratory rate & 1164.00 & 4.00 & 11.13 & 17.92 & 20.37 & 23.39 & 40.90 \\ Temperature & 1158.00 & 0.60 & 33.25 & 36.28 & 36.65 & 37.02 & 39.13 \\ SP O2 & 1164.00 & 2.29 & 75.91 & 95.00 & 96.45 & 97.91 & 100.00 \\ Urine output & 1899.28 & 1272.36 & 0.00 & 980.00 & 1675.00 & 2500.00 & 8820.00 \\ Hematocrit & 31.91 & 5.20 & 20.31 & 28.16 & 30.80 & 35.01 & 55.42 \\ RBC & 3.57 & 0.62 & 2.03 & 3.12 & 3.49 & 3.90 & 6.57 \\ MCH & 29.54 & 2.61 & 18.12 & 28.25 & 29.75 & 31.24 & 40.31 \\ MCHC & 32.86 & 1.40 & 27.82 & 32.01 & 32.98 & 33.82 & 37.01 \\ MCV & 89.90 & 6.53 & 62.60 & 86.25 & 90.00 & 93.85 & 116.71 \\ RDW & 15.95 & 2.13 & 12.08 & 14.46 & 15.51 & 16.93 & 29.05 \\ Leucocyte & 10.71 & 5.22 & 0.10 & 7.44 & 9.68 & 12.74 & 64.75 \\ Platelets & 241.50 & 113.12 & 9.57 & 168.90 & 222.66 & 304.25 & 1028.20 \\ Neutrophils & 80.11 & 11.13 & 5.00 & 74.77 & 82.46 & 87.45 & 98.00 \\ Basophilis & 0.41 & 0.46 & 0.10 & 0.20 & 0.30 & 0.50 & 8.80 \\ Lymphocyte & 12.23 & 8.63 & 0.96 & 6.65 & 10.47 & 15.46 & 83.50 \\ PT & 17.48 & 7.38 & 10.10 & 13.16 & 14.63 & 18.80 & 71.27 \\ INR & 1.62 & 0.83 & 0.87 & 1.14 & 1.30 & 1.73 & 8.34 \\ NT-proBNP & 11,014.13 & 13,148.66 & 50.00 & 2251.00 & 5840.00 & 14,968.00 & 118,928.00 \\ Creatine kinase & 246.77 & 1484.52 & 8.00 & 46.00 & 89.25 & 185.18 & 42,987.50 \\ Creatinine & 1.64 & 1.27 & 0.26 & 0.94 & 1.28 & 1.90 & 15.53 \\ Urea nitrogen & 36.29 & 21.85 & 5.35 & 20.83 & 30.66 & 45.25 & 161.75 \\ Glucose & 148.79 & 51.49 & 66.66 & 113.93 & 136.40 & 169.50 & 414.10 \\ Blood potassium & 4.17 & 0.41 & 3.00 & 3.90 & 4.11 & 4.40 & 6.56 \\ Blood sodium & 138.89 & 4.15 & 114.66 & 136.66 & 139.25 & 141.60 & 154.73 \\ Blood calcium & 8.50 & 0.57 & 6.70 & 8.14 & 8.50 & 8.86 & 10.95 \\ Chloride & 102.28 & 5.34 & 80.26 & 99.00 & 102.50 & 105.57 & 122.52 \\ Anion gap & 13.92 & 2.65 & 6.63 & 12.25 & 13.66 & 15.41 & 25.50 \\ Magnesium ion & 2.12 & 0.25 & 1.40 & 1.95 & 2.09 & 2.24 & 4.07 \\ PH & 7.37 & 0.06 & 7.09 & 7.33 & 7.38 & 7.43 & 7.58 \\ Bicarbonate & 26.91 & 5.16 & 12.85 & 23.45 & 26.50 & 29.87 & 47.66 \\ Lactic acid & 1.85 & 0.98 & 0.50 & 1.20 & 1.60 & 2.20 & 8.33 \\ PCO2 & 45.53 & 12.71 & 18.75 & 37.04 & 43.00 & 50.58 & 98.60 \\ EH & 48.71 & 12.86 & 15.00 & 40.00 & 55.00 & 55.00 & 75.0 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Statistical Analysis of dataset features.