but not all are equally reliable.
Systematic reviews and meta-analyses*
are considered to be the least biased forms of evidence synthesis.
This is true, if they follow a systematic review process –
procedures designed to reduce risk of bias*
and increase transparency*.
To reduce risk of bias in our database
we followed the systematic review process.
We are also transparent about what we did –
technical report on search and data extraction
can be downloaded here.
| *meta-analyses are systematic reviews that do some number-crunching using statistics *risk of bias he risk of overestimating or underestimating the true effect *transparency means being open and explicit about all details of your work |
 |