Fig. 3

Effect plots of the multivariable linear regression model with the outcome ‘on-scene time’ (in minutes), separately for the child and adult sub-groups. Mean and 95% confidence intervals are shown. Note that the number of diagnoses and measures are considered as factor variables here to assess the linearity of the association between the number of measures and on-scene time. HHO helicopter hoist operations, NACA National Advisory Committee for Aeronautics