Items (defined in Table 2)
Study ID	A	B	C	D	E	F	G	H	I	J	K	L
Aglietti 1994	0	0	0	2	0	0	2	2	2	2	2	2
Aglietti 2004	0	0	2	2	0	0	2	2	2	2	2	2
Anderson 2001	1	1	0	2	0	0	2	2	2	2	2	2
Aune 2001	2	1	0	2	0	0	2	1	2	2	2	2
Beynnon 2002	1	0	0	1	0	0	2	2	2	2	2	2
Ejerhed 2003	2	1	0	2	0	0	2	0	2	2	2	1
Eriksson 2001	1	1	0	1	0	0	2	2	2	2	1	1
Feller 2003	1	1	0	2	0	0	2	1	2	2	2	2
Ibrahim 2005	0	0	0	1	0	0	2	0	2	1	1	1
Jansson 2003	0	1	0	1	0	0	2	1	2	2	1	1
Laxdal 2005	2	1	0	2	0	0	2	0	2	2	2	2
Maletis 2007	2	2	2	2	0	0	2	2	2	2	1	2
Marder 1991	0	0	0	1	0	0	2	0	2	2	1	1
Matsumoto 2006	0	0	0	1	0	0	2	1	2	2	2	2
O'Neill 1996	0	1	0	2	0	0	2	1	2	2	1	2
Ropke 2001	0	0	0	1	0	0	2	1	2	2	2	1
Sajovic 2006	0	1	0	2	0	0	2	2	2	2	2	2
Shaieb 2002	0	1	0	1	0	0	2	1	2	2	1	2
Zaffagnini 2006	0	1	0	2	0	0	2	1	2	2	2	1