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Table 1 Explanatory variables used in the prediction modelling

From: Patient and case characteristics associated with ‘no paramedic treatment’ for low-acuity cases referred for emergency ambulance dispatch following a secondary telephone triage: a retrospective cohort study

Variable name

Reference category

Age

55–59 year olds (selected because it contained the mean age for the cases included in this study)

Gender

Males

Income status

The ‘above’ category

Qualification

ALS paramedics (because they triaged the largest volume of cases)

Pain level

Mild

Time of day

Day shift

Triage guideline groups

Given the outcome variable involved the presence or absence of ALS paramedic treatment, the category with the most similar paramedic treatment rate to all Victorian emergency ambulance cases (55.5%) was chosen to compare with the triage guideline groups – the urinary symptoms group (paramedic treatment rate of 55.2%)