Table 1.

 Level of information provided in the 10 meta-analysis protocols used in this study for data extraction

Information	Meta-analysis
	Gava et al7	Woodford et al8	Martinez et al9	Orlando et al10	Buckley et al11	Ipser et al12	Mistiaen et al13	Afolabi et al14	Uman et al15	Moore et al16
Possible control group(s)	√		√	√	√	√	√	√	√	√
Hierarchy of control groups								√*		√*
Which time point to select					√		√			√
Whether to use change from baseline or values after treatment		√		√	√	√
Hierarchy of measuring methods or scales

*Only one possible control group stated