A New Biomedical Passage Retrieval Framework for Laboratory Medicine: Leveraging Domain-specific Ontology, Multilevel PRF, and Negation Differential Weighting

Table 2

Descriptive statistics of biomedical literatures used for passage retrieval.

	HCDMLM2017	PGDT2003	RCPBD2014
Number of pages	5,070	652	3,269
Number of chapters	77	9	29
Number of images	1,362	—	1,445
Number of sentences	109,381	10,231	55,369
Number of paragraphs	31,456	5,051	19,721