Table 3

Comparison of the ambient dose equivalent (nSV) for conventional and upside-down positioning in different models averaged over all three angulations

Model	Position	PO	P value	Assistant	P value	Nurse	P value	Anaesthetist	P value
Adult	Conventional	2569±807	<0.01	61±54	<0.01	15±9	0.41	8±6	0.26
Adult	Upside-down	135±23	<0.01	134±60	<0.01	14±7	0.41	10±6	0.26
Paediatric	Conventional	351±104	<0.01	24±18	<0.01	1±3	0.71	2±5	1
Paediatric	Upside-down	121±56	<0.01	57±30	<0.01	2±4	0.71	2±5	1
Spherical	Conventional	3907±883	<0.01	100±70	<0.01	21±7	0.85	12±5	0.17
Spherical	Upside-down	126±13	<0.01	253±169	<0.01	22±8	0.85	13±4	0.17