Existing wording:

Conformance Requirement 15 (Stratification Criteria):
For patient-based measures, the CQL expression SHALL return a Boolean.
For event-based measures (e.g. episode-of-care), the CQL expression SHALL return a list of events of the same type as the population criteria.

Proposed wording:

Conformance Requirement 15 (Stratification Criteria):
For patient-based measures, the CQL stratification expression SHALL return a Boolean.
For event-based measures (e.g. episode-of-care), the CQLstratification expression SHALL return a list of events of the same type as the population criteria.