Database selection and data gathering methods in systematic reviews of qualitative research regarding diabetes mellitus - an explorative study

Justesen, Tobias; Freyberg, Josefine; Schultz, Anders N. Ø.

doi:10.1186/s12874-021-01281-2

Table 5 Databases included and their individual and combined recall of references

From: Database selection and data gathering methods in systematic reviews of qualitative research regarding diabetes mellitus - an explorative study

Combinations of two databases	References found (n)	Overall recall^a (%)	Median recall^b (%)	Minimum recall^c (%)	100.0% recall^d (%)	Number of SRs that searched the database. n (% of the 26 SRs)
GSc + EMB	497	99.2	100.0	87.5	84.6	1 (3.8)
GSc + SCO	492	98.2	100.0	84.6	88.5	0 (0)
GSc + WoS	491	98.0	100.0	87.5	76.9	0 (0)
GSc + ML/PM	490	97.8	100.0	85.7	80.8	1 (3.8)
GSc + CIN	490	97.8	100.0	84.6	76.9	1 (3.8)
GSc + PSI	487	97.2	100.0	84.6	73.1	1 (3.8)
ML/PM + CIN	483	96.4	100.0	75.0	69.2	20 (76.9)
CIN + SCO	482	96.2	100.0	77.8	65.4	3 (11.5)
EMB + CIN	481	96.0	100.0	75.0	65.4	9 (34.6)
EMB + SCO	477	95.2	98.6	75.0	50.0	1 (3.8)
ML/PM + SCO	475	94.8	100.0	75.0	57.7	4 (15.4)
WoS + SCO	470	93.8	95.1	75.0	38.5	2 (7.7)
ML/PM + EMB	467	93.2	95.5	62.5	46.2	12 (46.2)
EMB + WoS	464	92.6	92.8	62.5	34.6	6 (23.1)
PSI + SCO	464	92.6	95.1	75.0	38.5	3 (11.5)
CIN + WoS	461	92.2	93.2	58.3	34.6	6 (23.1)
ML/PM + WoS	455	90.8	100.0	62.5	53.9	8 (30.8)
EMB + PSI	455	90.8	91.9	62.5	26.9	7 (26.9)
ML/PM + PSI	445	88.8	96.7	62.5	50.0	12 (46.2)
CIN + PSI	411	82.0	83.3	25.0	19.2	10 (38.5)
PSI + WoS	409	81.6	83.3	50.0	19.2	4 (15.4)
Combinations of three databases
GSc + ML/PM + EMB	499	99.6	100.0	87.5	92.3	1 (3.8)
GSc + EMB + CIN	499	99.6	100.0	92.3	92.3	1 (3.8)
GSc + EMB + SCO	498	99.4	100.0	87.5	88.5	0 (0)
GSc + EMB + PSI	497	99.2	100.0	87.5	84.6	1 (3.8)
GSc + EMB + WoS	497	99.2	100.0	87.5	84.6	0 (0)
ML/PM + EMB + CIN	495	98.8	100.0	80.0	80.8	9 (34.6)
GSc + ML/PM + CIN	494	98.6	100.0	89.8	88.5	1 (3.8)
GSc + CIN + WoS	494	98.6	100.0	91.8	84.6	0 (0)
GSc + CIN + SCO	494	98.6	100.0	84.6	92.3	0 (0)
GSc + WoS + SCO	494	98.6	100.0	87.5	88.5	0 (0)
GSc + ML/PM + WoS	493	98.4	100.0	87.5	84.6	0 (0)
GSc + ML/PM + SCO	493	98.4	100.0	87.5	88.5	0 (0)
EMB + CIN + WoS	493	98.4	100.0	83.3	76.9	1 (3.8)
ML/PM + CIN + WoS	492	98.2	100.0	83.3	80.8	6 (23.1)
GSc + PSI + SCO	492	98.2	100.0	84.6	88.5	0 (0)
GSc + CIN + PSI	491	98.0	100.0	84.6	80.8	1 (3.8)
GSc + PSI + WoS	491	98.0	100.0	87.5	76.9	0 (0)
ML/PM + CIN + SCO	490	97.8	100.0	85.7	80.8	3 (11.5)
GSc + ML/PM + PSI	490	97.8	100.0	85.7	80.8	1 (3.8)
EMB + CIN + SCO	489	97.6	100.0	75.0	73.1	5 (19.2)
CIN + WoS + SCO	487	97.21	100.0	77.8	65.4	1 (3.8)
ML/PM + CIN + PSI	486	97.0	100.0	75.0	76.9	10 (38.5)
ML/PM + EMB + SCO	483	96.4	100.0	75.0	61.5	1 (3.8)
EMB + CIN + PSI	483	96.4	100.0	75.0	69.2	6 (23.1)
CIN + PSI + SCO	483	96.4	100.0	77.8	65.4	3 (11.5)
ML/PM + WoS + SCO	480	95.8	100.0	75.0	65.4	2 (7.7)
EMB + PSI + SCO	478	95.4	98.6	75.0	50.9	1 (3.8)
EMB + WoS + SCO	478	95.4	98.6	75.0	50.0	0 (0)
ML/PM + EMB + WoS	476	95.0	100.0	62.5	57.7	6 (23.1)
ML/PM + PSI + SCO	476	95.0	100.0	75.0	57.7	3 (11.5)
ML/PM + EMB + PSI	474	94.6	100.0	62.5	53.9	7 (26.9)
PSI + WoS+ SCO	471	94.0	95.1	75.0	38.5	1 (3.8)
EMB + PSI + WoS	468	93.4	94.0	62.5	38.5	3 (11.5)
CIN + PSI + WoS	466	93.0	95.7	58.3	42.3	3 (11.5)
ML/PM + PSI + WoS	459	91.6	100.0	62.5	53.9	4 (15.4)

CIN CINAHL, EMB Embase, GSc Google Scholar, ML/PM MEDLINE/PubMed, PSI PsycINFO, SCO SCO, WoS Web of Science
^aOverall recall: The total number of included references retrieved by the databases divided by the total number of included references retrieved by all databases
^bMedian recall: The median value of recall per systematic review
^cMinimum recall: The lowest value of recall per systematic review
^d100.0% recall: The percentage of reviews for which the database or database combination retrieved all included references

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