Table 1.
The top 18 variables selected on each day after employing predictive mean matching imputation with regard to 30-day mortality. I at the beginning of the variables’ names means indicator. Numbers represent the ranking after aggregating the ranking results from the 3 different feature selection methods.
| Day 1 | Day 2 | Day 3 | |||
| Variable | Score | Variable | Score | Variable | Score |
| BUNa | .762397 | AGb | .795419 | RDWc | .748997 |
| RDW | .680087 | HCO3d | .783337 | BUN | .666667 |
| MCHCe | .668965 | BUN | .77677 | HCO3 | .544964 |
| AG | .540484 | BEf | .609532 | BE | .540542 |
| I-Cag | .436429 | RDW | .608711 | pH | .488433 |
| Crh | .436071 | I-PO2i | .587151 | AG | .450426 |
| HCO3 | .416741 | I-PCO2 | .585947 | I-Lacj | .418716 |
| PO2k | .404289 | I-BE | .585592 | I-pH | .40463 |
| MCVl | .386964 | Clm | .53158 | Cr | .400008 |
| I-Phosn | .374431 | PTo | .462085 | Phos | .387661 |
| PTTp | .353913 | Lac | .461869 | I-PCO2 | .387019 |
| HGBq | .342786 | Cr | .451999 | I-PO2 | .386739 |
| pH | .32767 | PTT | .424956 | I-BE | .385935 |
| Lac | .320339 | Nar | .422474 | PCO2 | .367257 |
| BE | .320299 | Phos | .419171 | NEs | .360791 |
| I-Lac | .318216 | I-Lac | .415475 | MCV | .351266 |
| PCO2 | .316668 | MCV | .368343 | I-PTT | .338352 |
| I-TBilt | .31277 | MCHC | .363146 | Lac | .331205 |
aBUN: blood urea nitrogen.
bAG: anion gap.
cRDW: red cell distribution width.
dHCO3: bicarbonate.
eMCHC: mean corpuscular hemoglobin concentration.
fBE: base excess.
gCA: calcium.
hCr: creatinine.
iPO2: partial pressure of oxygen.
jLac: lactate.
kPCO2: partial pressure of carbon dioxide.
lMCV: mean corpuscular volume.
mCl: chloride.
nPhos: phosphate.
oPT: prothrombin time.
pPTT: partial thromboplastin time.
qHGB: hemoglobin.
rNa: sodium.
sNE: absolute neutrophils.
tTBil: total bilirubin.