Table 4.

Statistics of entities and relations in the constructed KG.

Entity types	Entity numbers	Relations	Relation numbers
Task	5673	USED-FOR	10,913
Region	5802	EQUAL-TO	10,326
Intervention	5279	ASSOCIATE-WITH	7640
Method	10,961	HAPPEN-IN	6214
Indicator	10,664	LOCATED-IN	12,311
Measure	10,931	CONJUNCTION	3206
Time	7771	PART-OF	531
Variable	2035	COMPARED-TO	332
Generic	1012	FEATURE-OF	233
OtherTerm	839	EVALUATE-FOR	434