3.2. Treatment retention
Seventy-one of the 94 subjects (76%) of the subjects completed the trial. Survival analysis of time to dropout showed no significant difference between the groups (see Fig. 2) (Log rank test = .01, p = .92). Treatment retention, measured by the number of visits attended was not significantly different between groups. On average, modafinil-treated subjects attended 12 visits and placebo-treated subjects attended 13 visits (t = 1.1, p = .28).