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

Table 5 Combined coverage rates of two databases

	RCTs found (n)	Overall recall^a (%)	Mean recall per SR^b (%)	Median recall per SR^c (%)	100% recall per SR^d (%)
Combination of two databases incl. Google Scholar
Cochrane Library + Google Scholar	417	94.3	95.2	100.0	83.5
Google Scholar + PEDro	416	94.1	96.4	100.0	83.5
Cochrane Library + PEDro	414	93.7	94.3	100.0	82.4
Combination of two databases excl. Google Scholar
Cochrane Library + PEDro	414	93.7	94.3	100.0	82.4
Cochrane Library + AMED	410	92.8	93.3	100.0	82.4
Cochrane Library + ICL	409	92.5	93.2	100.0	80.0

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