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. 2015 Mar;54(2):153–162.

Figure 1.

Figure 1.

Total citations in PubMed and total animal citations in PubMed by Year 1907 – 2012. The total number of references indexed PubMed by year for the years 1907 to 2012 (noncumulative). Blue bars represent the total number of references in PubMed in a given year. The red shading overlying the blue bars represents the total number of animal-related references indexed in PubMed in a given year. A search of all indexed material in PubMed was conducted on 12 December 2013 by using the search string (“1900/01/01”[PDAT]: “2012/12/31”[PDAT]). The ‘results by year file’ (.csv) was downloaded from Pubmed, and the values for the total number of citations by year were entered into an Excel (Microsoft, Redmond, WA) file. For each year from 1907 to 2012, a search was conducted (for example, (“1959/01/01”[PDAT]: “1959/12/31”[PDAT])), and a validated search filter for animal-related research28 was applied and the number entered into an Excel file. The quoted material is from reference 118.