Table 3. Summary of multivariable logistic regression following LASSO variable selection for ambulance service prealert for sites 1 and 2.
| Term | OR (95% CI) |
| Newly qualified paramedic | 1.3 (1.26 to 1.34) |
| Paramedic | 1.11 (1.08 to 1.13) |
| Senior clinician | 1.09 (1.03 to 1.15) |
| Male clinician | 0.98 (0.96 to 1) |
| Proportion of hospital turnarounds exceeding 30 min | 1.74 (1.6 to 1.9) |
| Patient age | 1.01 (1.01 to 1.01) |
| Male patient | 1.24 (1.22 to 1.26) |
| Patient presentation meets RCEM non-physiological prealert criteria | 15.85 (15.52 to 16.18) |
| Site one ambulance service | 1.94 (1.86 to 2.02) |
| Emergency departments (not designated as major trauma centres) 1–25 (see online supplemental additional file 4) | ORs between 0.38 (0.18 to 0.7) and 2.2 (2.11 to 2.3) |
| Major trauma centres 1–8 (see online supplemental additional file 4) | ORs between 0.81 (0.77 to 0.85) and 1.66 (1.58 to 1.74) |
Further details are supplied in online supplemental additional file 4.
LASSOleast absolute shrinkage and selection operatorRCEMRoyal College of Emergency Medicine