Retrospective optimal ratio and sample size calculation for the comparison of on-scene times for physician–paramedic partnerships and conventional paramedic crews with regard to missions flown to road-traffic collisions, other trauma calls, medical emergencies, entrapment incidents and non-entrapped patients with trauma
| Comparison of PPP and CPC | Actual ratio | Optimal ratio | Actual sample | Optimal sample |
|---|---|---|---|---|
| CPC, conventional paramedic crew; OTC, other trauma call; PPP, physician–paramedic partnerships; RTC, road traffic collision. | ||||
| RTCs | 2 | 0.84 | 90 | 3620 |
| OTCs | 1.81 | 1.08 | 90 | 2230 |
| Medical emergencies | 1.56 | 2 | 23 | 46 |
| Entrapment incidents | 8.67 | 1 | 29 | 26 |
| Non-entrapped patients | 1.56 | 1.3 | 151 | 428 |