Table 1.

Outcome measure definitions.

Outcome measure	Definition
Participants recruited	The number of potential participants recruited to the trial.
Proportion of participants eligible for enrollment	The number of potential participants who were eligible to be enrolled in the trial divided by the total number of participants recruited.
Enrolled in the trial	The number of participants who were enrolled in the trial divided by the total number of participants recruited.
Randomized	The number of participants who completed the 3-month run-in phase and then randomized divided by the total number of participants recruited.
Completed the trial	The number of participants who completed the 9-month trial divided by the total number of participants recruited.
Time investment per participant	The total number of hours spent on a recruitment strategy divided by the number of participants enrolled using that strategy.
Cost per participant	The total cost of a recruitment strategy divided by the total number of participants enrolled using that strategy.