Table 3.
Quality assessment of full-text studies using the QUIPS tool
| Author | Study participation | Study attrition | Prognostic factor measurement | Outcome measurement | Study confounding | Statistical analysis and reporting |
|---|---|---|---|---|---|---|
| Lau 2006 | 2 | 1 | 1 | 2 | 3 | 2 |
| Shaikh 2014 | 1 | 1 | 1 | 1 | 3 | 1 |
| Laundy 2003 | 1 | 1 | 2 | 2 | 2 | 3 |
| Lambert 2007 | 1 | 1 | 1 | 2 | 1 | 2 |
| Mansbach 2008 | 1 | 1 | 1 | 1 | 3 | 2 |
| Bennet 2007 | 1 | 1 | 2 | 1 | 2 | 2 |
| Chan 2007 | 1 | 1 | 2 | 1 | 3 | 2 |
| Garcia-Garcia 2017 | 1 | 1 | 1 | 1 | 2 | 1 |
| Marguet 2009 | 1 | 1 | 1 | 1 | 1 | 1 |
| Tsung 2010 | 2 | 1 | 1 | 1 | 2 | 2 |
| Franz 2010 | 1 | 1 | 1 | 1 | 1 | 1 |
| Lambert 2007 | 1 | 1 | 1 | 1 | 1 | 1 |
| Palomino 2004 | 1 | 1 | 3 | 1 | 2 | 1 |
| Tsolia 2003 | 2 | 1 | 2 | 2 | 3 | 1 |
| Chiu 2010 | 1 | 1 | 2 | 1 | 2 | 1 |
| Resch 2011 | 1 | 1 | 2 | 2 | 2 | 1 |
| Foshaug 2015 | 1 | 1 | 1 | 1 | 3 | 1 |
| Mullins 2011 | 1 | 1 | 2 | 1 | 2 | 1 |
| Iwane 2011 | 1 | 1 | 1 | 1 | 3 | 1 |
| Cohen 2015 | 2 | 1 | 1 | 1 | 1 | 1 |
| Gullu 2017 | 1 | 1 | 2 | 1 | 3 | 1 |
| Bamberger 2012 | 1 | 1 | 1 | 1 | 2 | 1 |
Risk of bias: high (3), moderate (2) or low (1).