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Table 2 Verification of the Poisson assumptions in the trial recruitment context

From: Concept and development of an interactive tool for trial recruitment planning and management

Assumption Trial recruitment context Assumption holds
Events taking place during one interval do not affect the next Each recruitment is independent of the next Yes
Events take place one at a time Patients are recruited individually, and recruitment data is recorded one at a time Yes
The average rate of events remains constant The assumption has been challenged by Williford et al. [27], but numerous other sources support the assumption [26, 28, 29] Yes