Timeline showing key events in the immediate and delayed arms.
EVENTS, SECONDARY, ADVERSE EVENT
Key events for the immediate intervention arm (top timeline in yellow) and delayed intervention arm (bottom timeline in black) are shown across the weekly timepoints (weeks indicated by axis at bottom of figure). Labelled boxes outline when intervention access is received (following baseline week for immediate arm, and following week 4 for delayed arm), and when intrusive memories (IMs) are recorded. Timepoints for questionnaires recorded at baseline, week 4, and week 8, are indicated along the week axis. We hypothesized a reduction in the number of intrusive memories during week 4 (primary outcome) in the immediate arm (intervention) compared to the delayed arm (comparator), controlled for baseline week. Intrusive memories were recorded by participants in a brief daily online diary for 7 days at baseline, week 4, and week 8 (delayed arm). The secondary outcomes included the number of intrusive memories in the delayed access arm at week 8 (within subjects), as well as clinical symptoms, work functioning and wellbeing at weeks 4 and 8 in both arms (between subjects). Adverse events were surveyed throughout the trial by scheduled questions and free report. We also report the acceptability ratings of the participants to the intervention.