Uptake
During the IAU condition, 3256 patients were referred to the iCBT services, of whom 588 (18.05%) received adequate exposure to the iCBT services. During the ItFits-toolkit condition, 3935 individuals were referred to the iCBT services, of whom 842 (21.39%) received adequate exposure. Over the course of the trial period, 7191 patients were referred and received log-in credentials to the iCBT services. Following local treatment protocols, 19.88% (1430/7191) patients received meaningful exposure to the iCBT services, 72.59% (5220/7191) dropped out of the iCBT service, 5.71% (410/7191) were using the iCBT service, and 4.35% (313/7191) did not start with the iCBT service when data collection was closed. Upon inspection of the data, changes in uptake over time followed an inconsistent and variable pattern, and no clear effect was visible with regard to the introduction of the ItFits-toolkit. This was confirmed in our modeling, which showed that differences in referral (mean