Table 3 Training corpus analysis
From: Combination of conditional random field with a rule based method in the extraction of PICO elements
Label | Number of sentences | % |
|---|---|---|
Population | 662 | 6.8% |
Intervention | 565 | 5.8% |
Outcome | 3564 | 36.6% |
Other | 2712 | 27.9% |
Study Design | 193 | 2.0% |
Background | 2031 | 20.9% |
Total | 9727 | 100.0% |