**2.6 Key variables**

Urine Output: The three EWS that shared the same variables as NEWS that incorporated urine output into their score had minor increases in AUROC, particularly for predicting mortality within 24 hours, but not for clinical deterioration [13–15]. Oliguria and anuria are signs of organ dysfunction and are therefore logically associated with predicting pending mortality.

Age: Age showed statistical significance in predicting the following adverse outcomes:, ICU (Intensive Care Unit) admission, attendance of the cardiac arrest team at a cardiorespiratory emergency, or death at 60 days with a small increase in AUROC from 0.67 to 0.72 [9]. This contradicts a subsequent study that compared multiple EWS and revealed that only the EWS that included age as co-variable did not outperform those excluding age in predicting deterioration [16].
