Table 1 Assessment of quality of included studies
Questions | Yeh et al. 2014 | Yaman et al. 2011 | Arslan et al. 2010 | Romashko et al. 2005 | Busaba et al. 2005 | Garavello et al. 2005 |
|---|---|---|---|---|---|---|
Clear definition of study population? | Yes | Yes | Yes | Yes | Yes | Yes |
Clear definition of outcomes and outcome assessment? | Yes | Yes | Yes | Yes | Yes | Yes |
Independent assessment of outcome parameters? | No | No | No | No | No | No |
Sufficient duration of follow-up? | N/A | N/A | N/A | N/A | N/A | N/A |
No selective loss during follow-up? | N/A | N/A | N/A | N/A | N/A | N/A |
Important confounders and prognostic factors identified? | No | No | No | Yes | Yes | Yes |