Table 13.
Datasets used in the analysis with details on size and relevant contents
| Dataset | February 2007 | January 2009 | April 2010 |
|---|---|---|---|
| Entrez Gene (including gene2pubmed and GeneRIF) | |||
| Total genes | 2,460,748 | 4,710,910 | 5,999,558 |
| Human genes | 38,604 | 40,183 | 45,423 |
| Baseline 2007 (Nov 2006) | Baseline 2009 (Nov 2008) | Baseline 2010 (Nov 2009) | |
| MEDLINE® | |||
| Total articles | 16,120,073 | 17,764,232 | 18,502,915 |
| gene2pubmed (Linking Entrez Gene and MEDLINE® | |||
| Total links | 3,081,413 | 12,960,489 | 5,979,167 |
| Total human gene links | 272,123 | 445,650 | 527,821 |
Although the number of human genes has not increased much over the years, the number of non-human links has increased substantially since 2007, while the human gene links have increased at a more moderate rate. Previously, MEDLINE®/PubMed® links from genomic sequence were propagated to all related genes. This practice was discontinued in March 2009, resulting (at the time) in a 60% decrease in links and the disparity in the number of overall links from 2009 to 2010.