Table 2.
Quality assessment of included studies
| Study | Study participation | Prognostic factor measurement | Analysis |
|---|---|---|---|
| Soares, 2006 [15] |
Yes |
Yes |
Yes |
| Serrato, 2007 [16] |
Yes |
Yes |
Yes |
| Ledoux, 2008 [34] |
Yes |
Yes |
Yes |
| Duke, 2008 [26] |
Yes |
Yes |
Yes |
| Tsai, 2008 [31] |
Yes |
No |
Yes |
| Sakr, 2008 [35] |
Yes |
Yes |
Yes |
| Metnitz, 2009 [36] |
Yes |
Yes |
Yes |
| Capuzzo, 2009 [39] |
Yes |
Yes |
Yes |
| Strand, 2009 [37] |
Yes |
Yes |
Yes |
| Alves, 2009 [17] |
Yes |
Yes |
Yes |
| Mbongo, 2009 [40] |
Yes |
Yes |
Yes |
| Poole, 2009 [41] |
Yes |
Yes |
Yes |
| Maccariello, 2010 [18] |
Yes |
No |
Yes |
| Silva Junior, 2010 [19] |
Yes |
Yes |
Yes |
| Khwannimit, 2010 [27] |
Yes |
Yes |
Yes |
| Soares, 2010 [20] |
Yes |
Yes |
Yes |
| Khwannimit, 2011 [28] |
Yes |
Yes |
Yes |
| Lim, 2011 [32] |
Yes |
Yes |
Yes |
| Costa e Silva, 2011 [21] |
Yes |
No |
Yes |
| Christensen, 2011 [38] |
Yes |
NR |
Yes |
| Juneja, 2012 [29] |
Yes |
Yes |
Yes |
| Nassar Junior, 2012 [22] |
Yes |
Yes |
Yes |
| Keegan, 2012 [25] |
Yes |
Yes |
Yes |
| Nassar Junior, 2013 [23] |
Yes |
Yes |
Yes |
| De Oliveira, 2013 [24] |
Yes |
Yes |
Yes |
| Khwannimit, 2013 [30] |
Yes |
Yes |
Yes |
| Lim, 2013 [33] |
Yes |
Yes |
Yes |
| López-Caler, 2013 [42] | No | Yes | Yes |
NR, not reported.