Table 2.

Data content of CTKB data release 2020-10-01. A total number of 3,647,567 eligibility criteria rules are processed from 352,110 clinical trials. The target of these trials covers 3,844 unique conditions and 3,106 unique interventions. A total number of 8,695,529 entities are standardized, mapping into 87,504 unique medical concepts. The distribution of 87,504 unique standardized entities among five OMOP domains. Note that the percentage sum of five domains exceeds 100% due to a concept can have multiple domains. The ratios of entities used as inclusion and exclusion criteria are reported.

		Statistics
Trials processed		352,110
Individual criterion sentences or rules		3,647,567
Unique conditions		3,844
Unique interventions		3,106
Total number of eligibility criteria entities		8,695,529
Unique medical concepts as eligibility criteria entities		87,504
	Condition	47.82%
	Drug	23.01%
	Procedure	13.73%
	Measurement	24.70%
	Observation	5.28%
Inclusion criteria ratio		34.78%
Exclusion criteria ratio		65.22%