Database coverage and their use in systematic reviews regarding spinal manipulative therapy: an exploratory study

Table 6 Combined coverage rates of three databases

	RCTs found (n)	Overall recall^a (%)	Mean recall per SR^b (%)	Median recall per SR^c (%)	100% recall per SR^d (%)
Combination of three databases incl. Google Scholar
Cochrane Library + Google Scholar + PEDro	424	95.9	97.0	100.0	90.6
Cochrane Library + Google Scholar + AMED	420	95.0	95.6	100.0	88.2
Google Scholar + PEDro + AMED	419	94.8	96.8	100.0	85.9
Combination of three databases excl. Google Scholar
Cochrane Library + EMBASE + PEDro	417	94.3	95.2	100.0	85.9
Cochrane Library + ICL + PEDro	417	94.3	95.4	100.0	85.9
Cochrane Library + MEDLINE/PubMed + PEDro	417	94.3	95.2	100.0	85.9

RCT randomized controlled trial, SR systematic review
^aOverall recall: The total number of included references retrieved by the database(s) divided by the total number of included references
^bMean recall per SR: The average recall rate per SR
^cMedian recall per SR: The median value of recall per SR
^d100% recall per SR: The percentage of SRs for which the database(s) retrieved all included references

ISSN: 2045-709X