Table 3 Statistical features (marked with *) and knowledge-based (marked with †) features extracted for classifying sentences.

Position in the document (absolute, relative) *

Sentence length *

Number of punctuation marks *

Number of numeric numbers n > 10, n < 10 *

Word overlap with title *

Number of cue-words (P, I, O)†

Number of cue-verbs (P, I, O)†

MeSH semantic types

Number of (n = [0-9]+) †