Figure. Flow of Participants in the Trial of a Workplace Wellness Program on Employee Health and Economic Outcomes.

^aRandomization took place at the level of the worksite.

^bAll individuals were assigned to treatment or control status based on the first worksite in which they appeared during the treatment period. The number of employees in each arm of the trial represents the number of unique individuals employed in the company’s workforce in one of the 160 worksites during the study period.

^cThere was natural employment turnover at the company during the study period, so the number of employees at the beginning of the study period, the number at the end of the study period, and the mean number of months each worker was employed during the study period are also shown.

^dOnly workers employed at the end of the study period were eligible to complete the survey and clinical biometrics (they could choose to participate in either, both, or neither).