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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%