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Table 1 Methodological quality summary and level of evidence (LoE)

From: Optimal pain management for radical prostatectomy surgery: what is the evidence?

Study Generation of allocation sequence Allocation concealment Blinding of participants and personnel Blinding of outcome assessment Incomplete outcome data Selective outcome reporting LoE
Allaire 1992 [11] O O - - + O 2
Andrieu 2009 [12] O O - - O - 2
Aribogan 2002 [13] O O - + O - 2
Bilgin 2011 [14] + O + + O - 1
Borazan 2010 [15] + O + O O O 1
Brown 2004 [16] + O + O + O 1
Chelly 2011 [17] + O + + + - 1
Fant 2011 [18] + O + O + O 1
Gaitini 1996 [19] O O - - O -  
Gottschalk 1998 [20] O O + + O O 1
Groudine 1998 [21] + O + + + O 1
Gupta 20 06 [22] + O + + + - 1
Habib 2008 [23] O O + + + O 1
Habib 20 09 [24] + + + + + - 1
Haythornthwaite 1998 [25] O O - + O O  
Heid 20 07 [26] + O + + O - 1
Hohwu 20 06 [27] O + - - + O 1
Hong 2011 [28] + O + + + O 1
Huang 2001 [29] + O + + O O 1
Katz 2004 [30] + + + + + O 1
Liu 1995 [31] O O + + O O 1
Mayson 2000 [32] + O + + + O 1
Mazaris 2008 [33] O O - - O O 2
Ormiston 1981 [34] O O + O + - 1
Salonia 20 06 [36] + O - - O O 2
Shir 1994 [37] O O - + O O 2
Snijdelaar 2004a [38] + O + O + O 1
Snijdelaar 2004b [39] + O + + + - 1
Tauzin-Fin 2006 [40] + O + + O O 1
Tauzin-Fin 2007 [41] + O + + + O 1
Tauzin-Fin 2009 [42] + O + + + O 1
Wu 2005 [43] + O + + O O 1
Lauwick 20 09 [44] + + + O O O 1
Hong 20 09 [45] + O - + + - 1
Lee 2011 [46] O O - + O O  
Lukasewycz 20 1 0 [47] + O + + + - 1
Larijani 2004 [48] O O + O O -  
Weinberg 2014 [49] + O + + + O 1
Fuller 2013 [50] + + O + + + 1
Dirkmann 2015 [55] + + + + + + 1
Nuri-Deniz 2013 [56] + O - + + + 1
Ozbek 2013 [57] + - + + O + 1
Elkassabany 2013 [59] + + + + + + 1
Kristensen 2013 [61] + + + + + + 1
Deniz 2012 [62] + - - O + O 1
  1. ‘+’ low risk of bias; ‘-’ high risk of bias; ‘O’ unclear risk of bias