Turning to the impact of the treatments, Figure 3 shows the treatment
outcomes, normalized by the mean of donation center times donor frequency over all treatments.
The gure shows the change in the fraction of usable donations of the three treatments relative
to the baseline invitation, along with the standard error of the mean. As the gure shows, there
is almost no eect of the appeal alone, and only a weak eect of the free cholesterol test. The
lottery ticket, however, has a positive eect and appears to be the most eective of the three
treatments. The frequency of donations is about 4 percentage points higher than in the baseline
treatment.