Laparoscopic Cholecystectomy Update 2006 Quality Scoring + Levels of Evidence
| Study ID | Allocation Concealment | Quality Score | Level of Evidence |
| Abdel-Raouf 2004 | B | 1 | 1 |
| Ainslie 2004 | B | 2 | 1 |
| Aitola 1998 | B | 3 | 1 |
| Alexander 1996 | A | 4 | 1 |
| Alponat 2002 | A | 2 | 2 |
| Ayoglu 2005 | B | 4 | 1 |
| Barczynski 2003 | A | 5 | 1 |
| Barczynski 2004 | A | 4 | 1 |
| Bisgaard 1999 | B | 4 | 1 |
| Bisgaard 2000 | B | 4 | 1 |
| Bisgaard 2002 | A | 5 | 1 |
| Bisgaard 2003 | A | 5 | 1 |
| Bisgaard 2004 | A | 4 | 1 |
| Boccara 2005 | A | 5 | 1 |
| Bresadola 1999 | B | 2 | 2 |
| Busley 1999 | B | 1 | 2 |
| Cengiz 2005 | A | 4 | 1 |
| Cheah 2001 | A | 4 | 1 |
| Cheng 2004 | A | 4 | 1 |
| Chundrigar 1993 | B | 3 | 2 |
| Chung 2004 | B | 4 | 1 |
| Curet 2002 | A | 2 | 1 |
| Damen 2004 | A | 4 | 1 |
| Dath 1999 | B | 3 | 2 |
| Elfburg 2000 | B | 3 | 2 |
| Elhakim 1995 | A | 3 | 1 |
| Elhakim 2000a | A | 3 | 1 |
| Elhakim 2000b | B | 3 | 1 |
| Elhakim 2002 | A | 4 | 1 |
| Farley 2004 | A | 5 | 1 |
| Forse 1996 | A | 3 | 1 |
| Fredman 1994 | B | 5 | 1 |
| Fredman 1995 | A | 5 | 1 |
| Fujii 1998 | A | 3 | 1 |
| Gan 2004a | B | 4 | 1 |
| Grundmann 2001 | B | 1 | 2 |
| Gupta 2002 | A | 5 | 1 |
| Hausel 2005 | A | 4 | 1 |
| Hawasli 1994 | A | 2 | 1 |
| Hernandez-Palazon 2003 | B | 3 | 1 |
| Holte 2004 | A | 5 | 1 |
| Huang 2003 | A | 2 | 1 |
| Jabbour-Khoury 2005 | B | 2 | 1 |
| Jiranantarat 2002 | B | 2 | 2 |
| Johnson 1999 | B | 2 | 1 |
| Jorgensen 1995 | B | 3 | 1 |
| Joris 1995 | B | 2 | 2 |
| Joshi 2004 | A | 5 | 1 |
| Keulemans 1998 | A | 2 | 1 |
| Kolsi 2000 | B | 3 | 1 |
| Kum 1996 | A | 2 | 1 |
| Labaille 2002 | B | 4 | 1 |
| Lam 2000 | A | 2 | 2 |
| Lane 1996 | B | 2 | 2 |
| Larsen 2001 | A | 4 | 1 |
| Launo 2004 | B | 2 | 1 |
| Lee 2001 | B | 3 | 1 |
| Leggett 2000 | B | 2 | 2 |
| Lepner 2003 | A | 4 | 1 |
| Lindgren 1995 | B | 2 | 1 |
| Liu 1993 | A | 3 | 1 |
| Look 2001 | A | 3 | 2 |
| Luchetti 1996 | B | 1 | 2 |
| Maestroni 2002 | B | 3 | 2 |
| Mathisen 1999 | A | 4 | 1 |
| Michaloliakou 1996 | A | 5 | 1 |
| Motamed 2000 | A | 5 | 1 |
| Mouton 1999 | B | 2 | 2 |
| Mraovic 1997 | B | 5 | 1 |
| Munoz 2005 | A | 4 | 1 |
| Munoz 2002 | B | 3 | 1 |
| Munro 1998 | B | 4 | 1 |
| Naguib 1998 | B | 3 | 1 |
| Naguib 2000 | B | 3 | 1 |
| Naja 2004 | A | 4 | 1 |
| Ng 2003 | A | 5 | 1 |
| Nursal 2003 | B | 2 | 1 |
| O’Hanlon 2002 | A | 5 | 1 |
| Owen 1997 | B | 4 | 1 |
| Pandey 2004 | B | 4 | 1 |
| Papagiannopoulou 2003 | B | 3 | 1 |
| Papaziogas 2001 | B | 3 | 1 |
| Pasqualucci 1994 | B | 3 | 1 |
| Pasqualucci 1996 | B | 4 | 1 |
| Paulson 2002 | A | 4 | 1 |
| Pavlidis 2003 | A | 5 | 1 |
| Perrakis 2003 | A | 3 | 2 |
| Poon 2003 | B | 4 | 1 |
| Puttick 1999 | A | 2 | 1 |
| Rademaker 1994 | B | 3 | 1 |
| Raetzell 1995 | B | 3 | 1 |
| Razek 2003 | B | 3 | 1 |
| Saad 2000 | B | 1 | 1 |
| Sarac 1996 | B | 1 | 2 |
| Sarli 2000 | B | 5 | 1 |
| Sarli 2003 | A | 3 | 1 |
| Scheinin 1995 | B | 3 | 1 |
| Schulte-Steinberg 1995 | B | 3 | 1 |
| Schwenk 2000 | B | 2 | 1 |
| Scott 1992 | B | 1 | 2 |
| Slim 1999 | A | 5 | 1 |
| Sung 2000 | B | 3 | 1 |
| Szem 1996 | B | 2 | 2 |
| Trichak 2003 | B | 1 | 1 |
| Tsimoyiannis 1998a | B | 2 | 1 |
| Tsimoyiannis 1998b | B | 2 | 1 |
| Tsimoyiannis 1998c | B | 2 | 1 |
| Uen 2002 | A | 2 | 1 |
| Ure 1993 | B | 3 | 1 |
| Usmani 2004 | B | 2 | 1 |
| Uzunkoy 2001 | B | 1 | 1 |
| Vezakis 1999 | A | 3 | 1 |
| Wallace 1997 | A | 4 | 1 |
| Weber 1997 | B | 2 | 2 |
| Wilson 1994 | A | 5 | 1 |
| Wu 1999 | B | 2 | 1 |
| Wu 2005 | A | 4 | 1 |
| Yeh 2004 | B | 4 | 1 |
| Young 2001 | B | 1 | 2 |
| Zajaczkowska 2004 | A | 4 | 1 |
| Zmora 2000 | B | 3 | 1 |