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. 2015 Apr 15;15:48. doi: 10.1186/s12876-015-0277-3

Table 4.

Citation matrix

Systematic review included RCTs Golub 1998 Meynaud-Kraemer 1999 Temple 1999 Bennett 2007 Li 2010 Liu 2010 Sauerland 2010 Wei 2011 Ohtani 2012
N = 16 N = 8 N = 12 N = 33 N = 44 N = 16 N = 67 N = 25 N = 39
DeWilde 1991 x
Attwood 1992 x x x x x x
Kum 1993 x x eFU x x x x
Olsen 1993 x
Tate 1993 x x x x x x x
Hebebrand 1994 x x
Eichen 1994 x
Frazee 1994 x x x x x x x x
Jadallah 1994 x
Rohr 1994 x eFT eAR
Martin 1995 x x x x x x x x x
Ortega 1995 x x x x x x x x
Settmacher 1995 x
Cox 1996 x x x x x x x x
Hansen 1996 x x x x x x x x
Hart 1996 x x x x x x
Lejus 1996 x x x x
Mutter 1996 x x x x x x x
Williams 1996 x x x x x x x x
Pozo 1996 x
Yin 1996 x x
Kazemier 1997 x x x x x x x
Laine 1997 x x x x x
Macarulla 1997 x x x x x x
Minné 1997 x x x x x x
Reiertsen 1997 x eFU x x x x
Schippers 1997 x
Sezeur 1997 x
Yeung 1997 x
Heikkinen 1998 x x x x x
Stare 1998 x
Sun 1998 x
Zhang 1998 eFT x
Klingler 1998 x x x x
Witten 1998 x
Barth 1999 xUS x
Bauwens 1999 x
Hellberg 1999 x x x x x x
Hellberg 2001 era x
Enochsson 2001 eSA era x
Kald 1999 x x x
Perner 1999 x
Özmen 1999 x x x x
Navarra 2000 x
Nordentoft 2000 x x x
Huang 2001 x x x x x
Helmy 2001 x x x x
Larsson 2001 eDL eDL x
Lavonius 2001 x x x
Long 2001 x x x x x x
Pedersen 2001 x x x x x x
Al-Mulhim 2002 x x x x
Little 2002 x x
Bruwer 2003 x x x x
Karadayi 2003 x x x
Milewczyk 2003 x x eAC x x
Vallribera 2003 x
van Dalen 2003 eDL eDL x
Oka 2004 x eNR x x
Ignacio 2004 x x x x x x
Lintula 2001 era x x x
Lintula 2002 era x
Lintula 2004 x x x
Katkhouda 2005 x x x x x x
Olmi 2005 x x x x
Moberg 2005 x x x x x x
Kaiser 2006 x
Ricca 2007 x x
Tzovaras 2007 x x x
Bolla 2008 x
Moirangthem 2008 x x
Kehagias 2008 x
Kaplan 2009 x x
Kehagias 2009 x
Simon 2009 x x
Wei 2010 x x x x
Tzovaras 2010 x
Kouhia 2010 x
Shirazi 2010 x
Khalil 2011 x
Clarke 2011 x

x: included in review; xUS: unpublished study included since trial was known to the authors; eAC: no allocation concealment; eAR: only as abstract reported and author request remained unanswered; eFU: follow-up < 80%; eFT: full text not available; eNR: not randomised; eDL: use of diagnostic laparoscopy followed by open appendicectomy in the laparoscopy arm; eSA: analysed a subgroup of the patients reported in a previous paper; era: not the most recent or highest quality article.