Table 1. Description of the three different techniques, called P1, P2, and P3, each performed with (S1) and without (S0) a rigid cervical collar.

Name technique	Description
P1S0	Rescue sheet technique without a rigid cervical collar
	(Rescue sheet: “Rettungstuch” Söhngen)
P1S1	Rescue sheet technique with a rigid cervical collar
	(Rigid cervical collar: Ambu perfit ACE, Ambu Rescue sheet: “Rettungstuch”, Söhngen)
P2S0	Vacuum mattress technique including scoop stretcher transfer without a rigid cervical collar
	(Scoop stretcher: „Schaufeltrage“, Söhngen Vacuum mattress: “Vakuummatratze”, Schnitzler)
P2S1	Vacuum mattress technique including scoop stretcher transfer with a rigid cervical collar
	(Rigid cervical collar: Ambu perfit ACE, Ambu Scoop stretcher: „Schaufeltrage“, Söhngen Vacuum mattress: “Vakuummatratze”, Schnitzler)
P3S0	Long spinal board technique without a rigid cervical collar
	(Long spinal board, Headblocks, Spider Straps: Baxstrap, Laerdal)
P3S1	Long spinal board technique with a rigid cervical collar
	(Rigid cervical collar: Ambu perfit ACE, Ambu Long spinal board, Headblocks, Spider Straps: Baxstrap, Laerdal)