Table 4 Methodological quality scores of included trial reports

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