Table 8.

Statistics of extraction errors by our method

Error type	FN	FP	Total	%
NER or normalization errors	254	58	312	39.90
CID relations mentioned in single sentences	148	124	272	34.78
CID relations asserted across sentences	63	54	117	14.96
Extracted disease or chemical in CID is too general	0	46	46	5.88
The extracted disease/chemical pair is a treatment relation	0	29	29	3.71
Annotated CID relations absent in the abstract	6	0	6	0.77
Total	471	311	782