Patients Hospitalized in General Wards via the Emergency Department: Early Identification of Predisposing Factors for Death or Unexpected Intensive Care Unit Admission—A Historical Prospective
Figure 2
Cumulative hazard due to the variables “current medications unknown” and “oxygen therapy on the ED” plots the logarithm of the cumulative target event rate against the logarithm of time according to the presence or not of the variables current medications unknown (a) and oxygen therapy in the ED (b). It permits graphically verifying that the hazard ratios are independent of time approximately parallel curves. This was also examined for all other variables retained in the Cox model to ascertain that the assumption of hazard proportionality was not violated. ED: emergency department.
