Table 1.

Descriptive statistics of the annotated eligibility criteria corpus

Measures	Counts
Corpus overview
Total no. of trials	230
Total no. of sentences	5634
Average sentence length	12
Entity class
Condition	4136
Observation	1756
Drug/substance	1464
Procedure/device	652
Attribute class
Qualifier/modifier	1715
Temporal constraints	811
Measurement	1025
Relation
Modified by	1096
Has temporal measure	882
Has measurement	1551