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Table 2 Retrieval and Non-retrieval of references across databases and reasons for non-retrieval

From: Searching for Programme theories for a realist evaluation: a case study comparing an academic database search and a simple Google search

 

Google

Academic databases

Study reference

Retrieval in Google (non-retrieval reason)

Retrieval in MEDLINE non-retrieval reason)

Retrieval in EMBASE

(non-retrieval reason)

Retrieval in CINAHL (non-retrieval reason)

Retrieval in Cochrane (non-retrieval reason)

Bell 2005

✓

X

X

3

X

Chapman 2014

✓

X

X

X

X

Guy 2012

✓

2,3

2, 3

3

X

Green 2017

✓

X

X

X

X

Fletcher 2017

✓

X

2, 3

3

X

Torra i Bou 2006

✓

X

X

X

X

Moore 2014

✓

2

X

✓

✓

Johansen 2014

1

✓

✓

✓

X

Kottner 2010

1

4

4

X

X

EPUAP/ NPUAP 2014

1

X

X

X

X

  1. X: the reference was not stored (or indexed) in the database at time of search
  2. Reasons for non-retrieval when database did contain the reference
  3. 1: not within first 5 pages of Google search
  4. 2: No age limit indexing
  5. 3: No terms from theory and publication types search concept
  6. 4: In PubMed but not Ovid Medline 1946-present