Table 4.
Feature Category |
Feature Type | Number of features |
Description |
---|---|---|---|
Semantic | Predication | 7 | Total number of predications with a treatment-related predicate (1 feature) and number of predication instances per treatment-related predicate (i.e., TREATS / NEG_TREATS, ADMINISTERED_TO / NEG_ADMINISTERED_TO, AFFECTS / NEG_AFFECTS, PROCESS_OF / NEG_PROCESS_OF, PREVENTS / NEG_PREVENTS, and COMPARED_WITH / HIGHER_THAN / LOWER_THAN / SAME_AS) - 6 features. |
Semantic | Population | 1 | Whether or not a sentence includes a description of the types of patients who are eligible to receive a certain treatment. |
Semantic | Concept | 5 | Total number of concepts in the sentence (1 feature) and number of concept instances per UMLS semantic group (i.e., Chemicals & Drugs (CHEM), procedures (PROC), physiology (PHYS), and disorders (DISO) - 4 features. |
Syntactic | Text-based | 4 | Four categories of potentially useful cue terms mentioned in Table 3 including “References to external content”, “Study design”, “Deontic terms and evidence source attributions” and “Treatment”. |