Figure 1.
Flow diagram the systematic review literature search results.
A total of 91 systematic reviews of intervention animal studies were included.
Figure 2.
Number (n) of published SRs of intervention animal studies per publication year (2005–2012).
Figure 3.
Percentages of SRs per number of internal validity item scored.
Zero items by 47.3%, one item all randomisation, two items randomisation and one level of blinding, three items randomisation, blinding of caretaker/investigator and blinding of outcome assessment or randomisation, one level of blinding and drop-outs) and all four items by 3.3%.
Figure 4.
Percentage of primary animal studies assessed per validity item; yes or no.