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Table 4 Methodological quality scores of included trial reports

From: Strategies for prevention of postoperative delirium: a systematic review and meta-analysis of randomized trials

Study Randomization Allocation concealment Blinding Withdrawal or dropouts ITT analysis Delirium assessor blinding Baseline similarity Delirium follow-up Total
Williams-Russo, 1999 [23] 2 2 0 1 1 1 1 2 10
Berggren, 1987 [17] 1 1 0 1 1 1 0 0 5
Williams-Russo, 1995 [20] 2 1 0 1 1 1 1 2 9
Kudoh, 2004 [27] 2 1 0 1 1 1 0 2 8
Papaioannou, 2005 [31] 2 1 0 1 1 0 1 1 7
Sieber, 2010 [47] 2 1 0 1 1 1 1 2 9
Nishikawa, 2004 [28] 1 2 0 1 1 1 0 1 7
Hudetz, 2009 [40] 1 2 0 1 0 1 1 2 8
Royse, 2011 [51] 2 2 1 1 0 1 1 0 8
Leung, 2006 [34] 2 2 0 0 0 1 1 0 6
Williams-Russo, 1992 [19] 2 1 0 1 0 1 0 2 7
Mann, 2000 [24] 2 1 0 1 0 1 1 2 8
Beaussier, 2006 [32] 2 1 2 1 0 1 0 2 9
Mouzopoulos, 2009 [43] 2 1 0 1 0 0 1 2 7
Musclow, 2012 [53] 2 2 2 1 1 1 0 2 11
Maldonado, 2009 [41] 2 1 0 1 1 1 1 1 8
Shehabi, 2009 [44] 2 1 2 1 1 1 1 2 11
Rubino, 2010 [46] 1 2 2 1 1 1 0 0 8
Liptzin, 2005 [30] 1 1 2 1 0 1 0 0 6
Sampson, 2007 [37] 2 2 2 1 0 1 0 2 10
Marcantonio, 2011 [48] 2 1 2 1 0 1 0 2 9
Gamberini, 2009 [39] 2 1 2 1 0 1 1 2 10
Kaneko, 1999 [22] 1 2 0 1 0 0 1 0 5
Kalisvaart, 2005 [29] 2 2 2 1 1 1 1 1 11
Wang, 2012 [54] 2 2 2 1 1 1 1 2 12
Larsen, 2010 [45] 1 1 2 1 1 1 0 2 9
Prakanrattana, 2007 [36] 2 2 2 1 1 1 1 2 12
Hakim, 2012 [52] 2 2 2 1 1 1 1 2 12
Leung, 2006 [33] 2 1 2 1 1 1 1 1 10
Pesonen, 2011 [50] 2 1 2 1 0 1 1 2 10
Aizawa, 2002 [26] 1 1 0 1 1 1 1 2 8
Taguchi, 2007 [38] 2 1 0 1 1 0 0 2 7
Ono, 2011 [49] 2 1 0 1 0 0 0 2 6
Schindler, 1989 [18] 1 1 0 1 0 0 0 0 3
McCaffrey, 2009 [42] 2 1 0 1 1 0 0 1 6
Marcantonio, 2001 [25] 2 2 0 1 1 1 0 2 9
Lundstrom, 2007 [35] 2 2 0 1 1 1 0 2 9
Kim, 1996 [21] 1 1 0 1 0 1 0 0 4