Table 1.

Allocation ratios of each active intervention versus its matched control and versus shared control in a platform trial. Within each window, each arm label and , , denotes an equal number of participants who are expected to enroll in the trial during that window and be randomized to the corresponding arm. However, the arm labels may denote different numbers of participants across different windows. For example, in Window 1, each arm label might denote 500 participants so that a total of 500 participants would be expected to be enrolled and randomized to each of  and , whereas in Window 2 each arm label might denote 100 participants, so that a total of 200 participants would be expected enrolled and randomized to and 100 to