1. Method of analysis used in the included studies.

Number	Study Name	Data included in analysis 1.1.1	Regression used	TRISS‐based method	Other analysis method used
1	Abe 2014	X	X
2	Andruskow 2013	X	X	X
3	Bartolacci 1998	X		X
4	Baxt 1983	X		X
5	Baxt 1987	X		X
6	Berlot 2009	X			X
7	Biewener 2004	X		X
8	Braithwaite 1998		X
9	Brown 2010		X
10	Brown 2011		X
11	Bulger 2012	X	X
12	Buntman 2002	X		X
13	Cunningham 1997	X	X
14	Davis 2005	X	X
15	Desmettre 2012	X	X
16	Di Bartolomeo 2001	X		X
17	Frey 1999		X
18	Frink 2007	X		X
19	Galvagno 2012	X	X
20	Giannakopoulus 2013	X	X	X
21	Koury 1998	X	X
22	McVey 2010			X
23	Mitchell 2007			X
24	Moylan 1988				X
25	Nardi 1994	X			X
26	Newgard 2010		X
27	Nicholl 1995	X		X
28	Phillips 1999	X		X
29	Rose 2012	X			X
30	Ryb 2013		X
31	Schiller 1988	X			X
32	Schwartz 1990		X	X
33	Stewart 2011	X	X
34	Sullivent 2011	X	X
35	Talving 2009	X	X
36	Thomas 2002	X	X
37	von Recklinghausen 2011	X	X
38	Weninger 2005	X			X