Project SAIL: Supporting Adolescents in Loss.

All changes to interventions were completed prior to data collection. A co-designed internet intervention for grief, of 8 modules over 4 weeks aims to reduce symptoms of anxiety, depression, prolonged grief and post-traumatic stress-disorder and improve well-being in adolescents aged 13-18 years residing in Australia. The 8 modules were chosen to be a brief, but also with enough material to improve wellbeing. The modules will include psychoeducation about grief and mental health, reframing loss, challenging self-blame and increasing pleasant events to improve mood. Content: The eight modules in the online grief intervention include; 1) psychoeducation about normalising grief and loss, 2) cognitive formulation of maintaining processes, 3) behavioural activation, improving self-care (eating/sleeping routines), and cognitive strategies of responsibility pie charts to challenge self-blame, 4) cognitive strategies through behavioural experiments to challenge negative thinking and predictions, 5) thought records and continuums to challenge all or nothing thinking and other negative thinking styles, 6) exposure to avoid triggers, memories, and mages including writing a letter, 7) imagery rescripting and memory updating, and problem solving, and 8) relapse prevention. Each module contains between 6 to 9 webpages, and completing two modules per week over four weeks will be suggested. Each module is predicted to take between 30 and 60 minutes. Outcomes. We will assess anxiety, depression, wellbeing, grief and post-traumatic stress disorder through self-report questionnaires. Participants will be screened online prior to acceptance into the trial for the intervention, those with high suicide risk will not be accepted into the trial and will be referred elsewhere.