Framework of RCT
The RCT is a parallel-group design with 2 arms and stratified (block size of 4) automated randomization in 2 age groups (18-30 years and 31-50 years). The eHealth developer and a statistician generated the random allocation sequence. The randomization was single-blinded for the participants. The researchers could track which participant was part of the control or intervention group but could not influence the randomization process. The RCT intervention group received the complete intervention, that is, access to a website with support for IPVA survivors with interactive components. The control group received minimal intervention with only the most essential static information (The participants for the RCT were largely recruited on the internet between April 1, 2019, and October 1, 2020, and signed up through self-referral or a DVA, social, or mental health care professional. Women in the RCT were between 18 and 50 years of age who had a sufficient comprehension of Dutch, experienced IPVA no longer than 1 year ago or were still experiencing significant fear of their partner. All participants digitally received an information letter and signed an informed consent form by checking a box. Through the information letter and a statement on the intervention website, participants were made aware that this study was conducted by researchers from the Radboudumc. Subsequently, we enforced a mandatory 24-hour waiting period to ensure participants had sufficient time to contemplate their decision to participate. Participants then provided digital consent again, filled out the M0 (baseline) questionnaires, and were randomized in the control or intervention arm. The intervention was frozen during the RCT, meaning no major changes to the intervention were made during the trial.The sample size was calculated based on the primary outcome measure, self-efficacy at 6 months, as described in the study protocol [