Open Access

Table 3

Assumptions and data requirements for quasi-experimental design.

Assumptions
−Underlying differences among systems from which patients of SAT/ECA studies are drawn remain unchanged over time.
−Any secular changes (e.g., clinical guidelines) over time affect the SATs and ECAs similarly.
Data requirements
−The systems from which SAT patients are drawn are different from those from which ECA patients are drawn; patients drawn within-system prior to and post intervention were different patients.
−Similar (if not identical) eligibility criteria (e.g., prognostic risk factors) are applicable to all patients.
−Except the SAT group, all information on the other 3 groups (i.e., the ECA with post-intervention measurement, ECA with pre-intervention measurement, and SAT with pre-intervention measurement) is extracted retrospectively via chart reviews.
−Concurrent timing (i.e., the pre-intervention period is similar between a SAT and an ECA; so is the post-intervention period).

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.