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

Table 7 Combined recall rates of four databases

	RCTs found (n)	Overall recall^a (%)	Mean recall per SR^b (%)	Median recall per SR^c (%)	100% recall per SR^d (%)
Combination of four databases incl. Google Scholar
Cochrane Library + Google Scholar + PEDro + CINAHL	424	95.9	97.0	100.0	90.6
Cochrane Library + Google Scholar + EMBASE + PEDro	424	95.9	97.0	100.0	90.6
Cochrane Library + Google Scholar + PEDro + ICL	424	95.9	97.0	100.0	90.6
Combination of four databases incl. Google Scholar
Cochrane Library + CINAHL + PEDro + ICL	418	94.6	95.6	100.0	87.1
Cochrane Library + EMBASE + PEDro + ICL	418	94.6	95.6	100.0	87.1
Cochrane Library + MEDLINE/PubMed + PEDro + ICL	418	94.6	95.6	100.0	87.1

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