Table 3: Haemorrhoid Surgery June 2006 Quality Scoring + Levels of Evidence
| Study | Allocation Concealment | Quality Score | Level of Evidence |
| Aasboe 1998 | B | 11111:5 | LoE 1 |
| Al-Mulhim 2006 | B | 10000:1 | LoE 1 |
| Amanor-Boadu 1992 | B | 10000:1 | LoE 1 |
| Andrews 1993 | B | 10000:1 | LoE 1 |
| Arbman 2000 | B | 10001:2 | LoE 1 |
| Armstrong 2001 | B | 10001:2 | LoE 1 |
| Arroyo 2004 | B | 10000:1 | LoE 1 |
| Arroyo 2006 | B | 11001:3 | LoE 1 |
| Balfour 2002 | A | 11111:5 | LoE 1 |
| Basdanis 2005 | B | 11001:3 | LoE 1 |
| Bikhchandani 2005 | B | 11000:2 | LoE 1 |
| Boccasanta 2001 | B | 11000:2 | LoE 1 |
| Boccasanta 2007 | A | 11001:3 | LoE 1 |
| Brown 2001 | B | 11001:3 | LoE 1 |
| Brunat 2003 | B | 10010:2 | LoE 1 |
| Carapeti 1998 | A | 11111:5 | LoE 1 |
| Cheetham 2003 | A | 11001:3 | LoE 1 |
| Chester 1990 | B | 11000:2 | LoE 2 |
| Chang 1999 | B | 10100:2 | LoE 2 |
| Chung 2002 | B | 11110:4 | LoE 1 |
| Chung 2005 | B | 11001:3 | LoE 1 |
| Colak 2003 | B | 10001:2 | LoE 1 |
| Correa 2002 | B | 11001:3 | LoE 1 |
| Davies 2003 | A | 11111:5 | LoE 1 |
| Di Vita 2003 | B | 10000:1 | LoE 2 |
| Filingeri 2004a (diathermy vs. SMH) | B | 11011:4 | LoE 1 |
| Fillingeri 2004b (modified SMH vs. conventional SMH) | B | 11011:4 | LoE 1 |
| Franklin 2003 | B | 11000:2 | LoE 1 |
| Galizia 2000 | B | 11001:3 | LoE 1 |
| Ganio 2001 | A | 11000:2 | LoE 1 |
| Gravie 2005 | B | 10001:2 | LoE 1 |
| Helmy 2000 | B | 11001:3 | LoE 2 |
| Hetzer 2002 | B | 11011:4 | LoE 1 |
| Ho 1997a (anal relaxant) | B | 10000:1 | LoE 1 |
| Ho 1997b (open vs. closed) | B | 10000:1 | LoE 1 |
| Ho 1998 | B | 11000:2 | LoE 2 |
| Ho 2000 | B | 11010:3 | LoE 1 |
| Ho 2001 | B | 11010:3 | LoE 1 |
| Ho 2006 | B | 11000:2 | LoE 1 |
| Hosch 1998 | B | 10001:2 | LoE 2 |
| Huang 2006 | B | 11001:3 | LoE 1 |
| Hwang 2003 | A | 11111:5 | LoE 1 |
| Ibrahim 1998 | B | 11000:2 | LoE 2 |
| Ingram 1998 | B | 10001:2 | LoE 2 |
| Jayne 2002 | B | 11011:4 | LoE 1 |
| Jóhannsson 2006 | B | 11001:3 | LoE 1 |
| Kairaluoma 2003 | B | 11001:3 | LoE 1 |
| Kanellos 2005 | A | 11010:3 | LoE 1 |
| Kecmanovic 2006 | B | 11000:2 | LoE 2 |
| Khalil 2000 | B | 11000:2 | LoE 1 |
| Khan 2001 | B | 10000:1 | LoE 2 |
| Khubchandani 2002 | B | 11001:3 | LoE 1 |
| Kilbride 1994 | B | 11111:5 | LoE 1 |
| Kim 2001 | B | 10110:3 | LoE 1 |
| Kim 2005 | B | 10001:2 | LoE 2 |
| Kisli 2005 | B | 10000:1 | LoE 2 |
| Kraemer 2005 | B | 11001:3 | LoE 1 |
| Krska 2003 | B | 10000:1 | LoE 2 |
| Kwok 2005 | B | 11111:5 | LoE 1 |
| La Torre 2004 | B | 11000:2 | LoE 1 |
| Lau 2004 | B | 11010:3 | LoE 1 |
| Lin 2004 | B | 10110:3 | LoE 1 |
| Liu 2000 | B | 10100:2 | LoE 1 |
| London 1987 | B | 11101:4 | LoE 1 |
| Luck 2000 | A | 11110:4 | LoE 1 |
| Madsen 1987 | B | 10011:3 | LoE 2 |
| Marsh 1993 | A | 11010:3 | LoE 1 |
| Mathai 1996 | B | 11000:2 | LoE 2 |
| Mehigan 2000 | B | 11001:3 | LoE 1 |
| Mikuni 2002 | B | 11001:3 | LoE 1 |
| Millito 2002 | B | 11000:2 | LoE 2 |
| Mlakar 2005 | B | 10001:2 | LoE 2 |
| Morisaki 1996 | B | 10110:3 | LoE 1 |
| Naja 2005 | A | 11111:5 | LoE 1 |
| Naja 2006 | B | 11001:3 | LoE 1 |
| Nicholson 2004 | B | 11111:5 | LoE 1 |
| Ong 2005 | B | 10000:1 | LoE 2 |
| Ortiz 2002 | B | 11000:2 | LoE 1 |
| Ortiz 2005 | B | 11001:3 | LoE 1 |
| Palazzo 2002 | B | 11000:2 | LoE 2 |
| Palimento 2003 | B | 11001:3 | LoE 1 |
| Pandini 2006 | B | 10000:1 | LoE 1 |
| Pattana-Arun 2006 | A | 11001:3 | LoE 1 |
| Patti 2005 | B | 11100:3 | LoE 1 |
| Patti 2006 | B | 11000:2 | LoE 1 |
| Pavlidis 2002 | B | 10001:2 | LoE 1 |
| Perez-Vicente 2006 | B | 11000:2 | LoE 1 |
| Pescatori 2000 | B | 11001:3 | LoE 1 |
| Pryn 1989 | B | 10110:3 | LoE 1 |
| Pybus 1983 | B | 10010:2 | LoE 2 |
| Roe 1987 | B | 10001:2 | LoE 1 |
| Rowsell 2000 | B | 11001:3 | LoE 1 |
| Roxas 2003 | A | 11110:4 | LoE 1 |
| Roxas 2006 | A | 11010:3 | LoE 1 |
| Senagore 1993 | B | 11011:4 | LoE 1 |
| Senagore 2004 | A | 11001:3 | LoE 1 |
| Seow-Choen 1992 | B | 11000:2 | LoE 1 |
| Shalaby 2001 | B | 11000:2 | LoE 1 |
| Silverman 2005 | A | 10110:3 | LoE 1 |
| Tan 2001 | B | 11000:2 | LoE 1 |
| Tan 2006 | A | 11111:5 | LoE 1 |
| Van de Stadt 2005 | B | 10000:1 | LoE 1 |
| Vinson-Bonnet 2002 | A | 11111:5 | LoE 1 |
| Wang 2006 | B | 11000:2 | LoE 1 |
| Wasvary 2001 | A | 11110:4 | LoE 1 |
| Yosry 2004 | B | 10000:1 | LoE 1 |
| You 2005 | A | 11000:2 | LoE 1 |
| Zuckermann 1993 | B | 10000:1 | LoE 1 |