Fig. 2From: Factors influencing on-scene time in a physician-staffed helicopter emergency medical service (HEMS): a retrospective observational studyRegression coefficients of the multivariable linear regression model with ‘on-scene time’ as the outcome. Mean and 95% confidence intervals are shown. Separate regression models were computed for (i) all patients, (ii) the child sub-group and (iii) the adult sub-group. HHO helicopter hoist operations, NACA National Advisory Committee for AeronauticsBack to article page