Table 1.

Incidence of emergency cricothyrotomies in selected studies identified in the searches employed in this review

Authors	Year	Country	Study design	Setting	Performers	Patient category	Secured airways	Cricothyrotomies
								Number	Percentage
Cook et al [19]	2008-2009	UK	Prospective	Hospital	Anaesthesiologists	Mix	2872600	58	0.002
Adams et al [4]	2005-2007	Iraq	Prospective	Prehospital	Physicians or combat medic	Trauma	293	17	5.8
Brown and Thomas [18]	1999	USA	Retrospective	Mix	Flight nurses	Mix	36	2	5.6
Germann et al [5]	1998-2006	USA	Prospective, single centre study	Prehospital	Flight nurses	Trauma (mainly)	369	6	1.6
Stephens et al [6]	1996-2006	USA	Retrospective	Hospital	Anaesthesiologists	Trauma	6088	21	0.3
Sagarin et al [7]	1996-2001	USA/Canada	Prospective, multicentre study	Hospital	Emergency medicine residents (mainly)	Mix	5757	50	0.9
Adnet et al [8]	1996-1997	France	Prospective, multicentre study	Prehospital	Emergency physicians and anaesthesiologists	Mix	691	0	0
McIntosh et al [9]	1995-2004	USA	Retrospective	Prehospital	Flight nurses (mainly)	Mix	712	17	2.4
Bair et al [10]	1995-2000	USA	Retrospective	Hospital	Emergency physicians or surgeons	Mix	201	22	10.9
Bair et al [10]	1995-2000	USA	Retrospective	Prehospital	Flight nurses	Mix	2259	28	1.2
Sakles et al [11]	1995-1996	USA	Prospective, single centre study	Hospital	Emergency medicine residents (mainly)	Mix	610	7	1.1
Fortune et al [12]	1991-1995	USA	Retrospective	Prehospital	EMTs	Mix	376	56	14.9
Jacobson et al [13]	1990-1994	USA	Retrospective	Prehospital	Paramedics	Trauma (mainly)	509	50	9.8
Nugent et al [14]	1987-1989	USA	Retrospective	Prehospital	Flight nurses	Trauma (mainly)	302	56	18.5
Robinson et al [15]	1983-1997	USA	Retrospective	Prehospital	Flight nurses (mainly)	Trauma	1589	8	0.5
Boyle et al [16]	1983-1988	USA	Retrospective	Mix	Flight nurses	Mix	650	69	10.6
McGill et al [17]	1977-1980	USA	Retrospective	Hospital	Emergency physicians or surgeons	Mix	1362	38	2.8