Table 3 The 12 most prognostic factors for the neural networks with 1 and 2 hidden layers (Rel-Imp: relative importance) and for the Random Survival Forest (VIMP: variable importance). Note that the NN utilises time intervals as one of the input variables (check the contribution of time intervals in Table 1 of Additional file 1). For RSF importance is measured for each variable without distinction for each level
Neural network 1h | Rel-Imp | Neural network 2h | Rel-Imp | RSF | VIMP |
|---|---|---|---|---|---|
Re-transplantation | 0.035 | Re-transplantation | 0.028 | Donor age | 0.010 |
Life-support | 0.025 | HCV (d) serology status | 0.025 | Re-transplantation | 0.009 |
Pre-treatment status ICU (a) | 0.023 | Life-support | 0.024 | Life support | 0.007 |
Donor type DCD (b) | 0.023 | Donor age | 0.023 | HCV (d) serology status | 0.007 |
Race Black (c) | 0.022 | Diabetes | 0.021 | Pre-treatment status | 0.006 |
HCV (d) serology status | 0.022 | Pre-treatment status ICU (a) | 0.020 | Recipient age | 0.004 |
Diabetes | 0.020 | Working income | 0.020 | Aetiology | 0.003 |
Donor age | 0.020 | Race Black (c) | 0.019 | log(Last serum creatinine) | 0.003 |
Working income | 0.018 | Previous abdominal surgery | 0.015 | Functional status | 0.002 |
Functional status Total assistance (e) | 0.017 | Donor pre-recovery diuretics | 0.015 | log(Total cold ischemic time) | 0.002 |
Aetiology HCV | 0.017 | Aetiology Cholestatic | 0.011 | Race | 0.002 |
Hypertensive bleeding | 0.017 | Functional status Total assistance (e) | 0.015 | Diabetes | 0.002 |