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Table 1 Literature review summary of used corpora

From: Combination of conditional random field with a rule based method in the extraction of PICO elements

Reference Training Corpus Testing Corpus
[8] 275
Manual and mixed
358
Mixed
[10] 148
Manual and mixed
75
Mixed
[13] 50
Manual and mixed
156
Mixed
[12] 800
Manual and mixed
200
Mixed
[11, 14, 30, 31] 1000
Manual and mixed
200
Mixed
[9] 1575 to 2280
Automatic and only structured abstracts
318
Mixed
[5,6,7] 2394 to 14,279
Automatic and only structured abstracts
2394 to 14,279
Only structured