Table 2.
Important Variable Selection with Boruta Algorithm.
| Variable | Mean Imp | Median Imp | Min Imp | Max Imp | Norm Hits | Decision |
|---|---|---|---|---|---|---|
| Lactate (mmol/L) | 32.77 | 32.68 | 29.04 | 35.91 | 1 | Confirmed |
| Bicarbonate (mmol/L) | 19.92 | 20.04 | 16.59 | 23.41 | 1 | Confirmed |
| Surgery prior to admission | 12.3 | 12.21 | 9.24 | 15.16 | 1 | Confirmed |
| Sepsis/septic shock | 6.79 | 6.64 | 4.79 | 10.19 | 1 | Confirmed |
| Creatinine (μmol/L) | 6.28 | 6.24 | 3.51 | 8.32 | 1 | Confirmed |
| Non-traumatic neurological disease | 5.77 | 5.79 | 2.76 | 7.79 | 1 | Confirmed |
| Chronic liver disease | 5.05 | 5.19 | 2.27 | 8.23 | 0.93 | Confirmed |
| Admission type (planned) | 4.78 | 4.79 | 1.37 | 7.37 | 0.95 | Confirmed |
| Sodium (mmol/L) | 4.18 | 4.19 | 2.17 | 7.02 | 0.86 | Confirmed |
| APACHE IV | 3.97 | 3.95 | 1.16 | 7 | 0.87 | Confirmed |
| Chronic kidney failure | 3.46 | 3.35 | 0 | 6.2 | 0.76 | Confirmed |
| Hx of organ transplantation | 3.22 | 3.22 | 0.37 | 5.58 | 0.71 | Confirmed |
| Mechanical ventilation (at admission) | 3.14 | 3.23 | −0.68 | 5.15 | 0.7 | Confirmed |
| Hx of malnutrition | 2.9 | 2.96 | −0.2 | 5.41 | 0.68 | Confirmed |
| Heart failure/cardiogenic shock | 2.54 | 2.69 | −0.3 | 4.36 | 0.54 | Tentative |
| Sex (male) | 1.41 | 1.21 | −0.93 | 3.38 | 0.04 | Rejected |
| Hx of immune deficiency | −0.03 | −0.13 | −3.17 | 2.26 | 0.01 | Rejected |
| Major trauma | −0.13 | −0.49 | −1.46 | 1.54 | 0 | Rejected |
Variable selection for contribution to FO on day three after ICU admission. History of (Hx). The laboratory markers lactate, sodium, bicarbonate, creatinine, and the APACHE IV score were measured at admission (=baseline). Mean Imp—the mean of IMp, Median Imp—the median of IMp, Min Imp—the minimum of IMp, Max Imp—the maximum of IMp, Norm Hits-the number of hits normalized to number of importance source runs, where. IMp is the importance measure computed over multiple iterations.