Colonic Resection Update 2009 Quality Scoring + Levels of Evidence
| Study ID | Allocation concealment | Quality Score | Level of Evidence (LoE) |
| Akça 2004 | A | 11110:4 | 1 |
| Anderson 2005 | B | 11000:2 | 2 |
| Basse 2005 | A | 10111:4 | 1 |
| Beaussier 2006 | A | 11111:5 | 1 |
| Beaussier 2007 | A | 11111:5 | 1 |
| Bonnet 1984 | B | 10000:1 | 2 |
| Bredtman 1990 | C | 11000:2 | 2 |
| Carli 2001 | B | 10000:1 | 2 |
| Carli 2002 | B | 10000:1 | 2 |
| Cheong 2001 | B | 10000:1 | 2 |
| Chen 2005 | B | 11111:5 | 1 |
| Chung 2007 | B | 11001:3 | 1 |
| Culebras 2007 | A | 11111:5 | 1 |
| Dahl 1992 | B | 11111:5 | 1 |
| Delaney 2003 | B | 11000:2 | 2 |
| Delauney 1993 | B | 10100:2 | 2 |
| Danelli 2002 | B | 11000:2 | 2 |
| De Kock 1994 | B | 10001:2 | 2 |
| De Kock 2005 | B | 11111:5 | 1 |
| Derrode 2003 | A | 11010:3 | 1 |
| Finucane 1996 | B | 10101:3 | 1 |
| Finucane 2001 | B | 10111:4 | 1 |
| Fleischmann 2005 | B | 11101:4 | 1 |
| Guignard 2000 | A | 11111:5 | 1 |
| Guignard 2002 | B | 11111:5 | 1 |
| Haase 2005 | B | 11001:3 | 1 |
| Herroeder 2007 | B | 11111:5 | 1 |
| Hoffman 2001 | B | 10001:2 | 2 |
| Kaba 2007 | A | 11111:5 | 1 |
| Kang 2004 | B | 11000:2 | 2 |
| Kilbride 1992 | B | 11000:2 | 2 |
| Kirdak 2008 | B | 11111:5 | 1 |
| Kong 2002 | B | 11111:5 | 1 |
| Koo 2003 | B | 10111:4 | 1 |
| Kuo 2006 | B | 11110:4 | 1 |
| Kurz 1995 | B | 11010:3 | 1 |
| Kurz 1996 | A | 11111:5 | 1 |
| Lavand’homme 2005 | B | 11111:5 | 1 |
| Le Blanc-Louvry 2002 | B | 10000:1 | 2 |
| Lee 2005 | A | 11001:3 | 1 |
| Lee 2008 | A | 11111:5 | 1 |
| Leung 2004 | B | 11001:3 | 1 |
| Liang 2002 | B | 11000:2 | 2 |
| Lindgren 2001 | B | 11001:3 | 1 |
| Liu 1995 | B | 11101:4 | 1 |
| Lu 2004 | B | 11110:4 | 1 |
| MacKay 2006 | A | 11001:3 | 1 |
| Maartense 2004 | B | 11001:3 | 1 |
| Marcello 2008 | B | 11001:3 | 1 |
| McDonnell 2007 | B | 11110:4 | 1 |
| Motamed 1998 | B | 10110:3 | 1 |
| Neudecker 1999 | B | 10000:1 | 2 |
| Nightingale 2007 | B | 11111:5 | 1 |
| Nitschke 1996 | B | 11001:3 | 1 |
| Polglase 2007 | A | 11111:5 | 1 |
| Scheinin 1987 | B | 10000:1 | 2 |
| Schlachta 2007 | A | 11111:5 | 1 |
| Schricker 2005 | B | 11101:4 | 1 |
| Schulze 1992 | B | 10001:2 | 2 |
| Schulze 1999 | B | 10001:2 | 2 |
| Schwenk 1998 | B | 10000:1 | 2 |
| Scott 1996 | B | 10000:1 | 2 |
| Senagore 2003 | B | 11001:3 | 1 |
| Sim 2007 | A | 11101:4 | 1 |
| Simpson 1993 | B | 10000:1 | 2 |
| Sjøstrom 1998 | B | 10000:1 | 2 |
| Stage 1997 | B | 10000:1 | 2 |
| Steinberg 2002 | B | 10001:2 | 2 |
| Targarona 2002 | B | 11001:3 | 1 |
| Taqi 2007 | B | 10001:2 | 2 |
| Tusek 1997 | B | 11000:2 | 2 |
| Watters 1993 | B | 11000:2 | 2 |
| Weeks 2002 | B | 11001:3 | 1 |
| Wordliczek 2002 | B | 10000:1 | 2 |
| Wu 2004 | B | 10100:2 | 2 |
| Xu 2008 | A | 11111:5 | 1 |
| Yeh 2005 | B | 10110:3 | 1 |
| Zarauza 2000 | B | 10111:4 | 1 |
| Zingg 2008 | B | 11111:5 | 1 |
| Zutshi 2005 | B | 11001:3 | 1 |