Table 1 The statistics of the TREC Precision Medicine covering the period of 2017–2019
| Name | 2017 and 2018 | 2019 |
|---|---|---|
| Abstract-Mean-Length | 77.5 | 83.5 |
| Abstract-Number | 26,613,834 | 29,137,637 |
| Chemical-Mean-Length | 3.8 | 3.8 |
| Chemical-Number | 13,113,093 | 13,670,358 |
| Mesh-Mean-Length | 10.5 | 10.6 |
| Mesh-Number | 24,387,151 | 25,389,659 |
| Keyword-Mean-Length | 4.1 | 4.4 |
| Keyword-Number | 4,005,446 | 5,435,471 |