Table 3

Criteria used to determine the potential for bias in the reviews

Criteria which had to be met

Criteria

++

+


1. Was there a focused aim or research question?

Yes

Yes


2. Explicit inclusion/exclusion criteria

Yes

Yes


3. More than 1 assessor/selector

Yes


4. Provide details of databases searched

Yes

Yes


5. Lists years searched

Yes

Yes


6. Followed up references in bibliographies

Yes


7. Experts consulted for further sources


8. Grey literature included/searched


9. Specified search terms/strategy

Yes

Yes


10. Not restricted to English language papers only

Yes


11. Quality assessed

Yes

Yes


12. Data supports conclusions

Yes

Yes


Jepson et al. BMC Public Health 2010 10:538   doi:10.1186/1471-2458-10-538

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