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. 2014 Oct 22;9(10):e109583. doi: 10.1371/journal.pone.0109583

Table 3. Summary of Methodology Documentation.

Percent of Articles Documenting Information (N)
Date of Search 34% (24/70)
Google Data Source 99% (69/70)
Query Variables
Location of Search 87% (61/70)
Time Period of Search 87% (61/70)
Query Category 19% (13/70)
Search Input Syntax
Clear Search Input, total’ 39% (27/70)
Excluding studies with only one term (n = 8) 31% (19/62)
Specifics:
Use of combination of terms (55/70 Eligible’)
Yes 31% (17/55)
Unclear 18% (10/55)
No 51% (28/55)
Use of Quotes (52/70 Eligible∼)
Yes 0% (0/52)
Unclear 81% (42/52)
No 19% (10/52)
Overall Reproducibility
Reproducible Articles* 7% (5/70)
Rationale
Rationale Provided for Search Input 67% (47/70)

’defined as providing clear use of quotes and combination.

‘eligibility = use of more than one term, ex. HIV + AIDS.

∼eligibility = use of a term with more than one word, ex. “HIV epidemic”.

*defined as addressing those fields which are modifiable within the portal by the user (therefore excluding date of search and data source).