Recruitment and eligibility
PTSD
DISORDER, REMISSION
Participant flow is summarized in an adapted CONSORT diagram (Figure Study flow of participants in the ENGAGE feasibility trial. Solid black lines denote participant flow through the study, including study drop outs i.e., those who discontinued the study. Dashed gray lines represent participants that were lost to follow‐up during assessments at post‐treatment (12 weeks) and follow‐up (6 months) respectively, but had not dropped out of the study.Ambiguities regarding eligibility arose in six cases. In three cases, parents met criteria for PTSD according to the M.I.N.I. but were included as symptoms were mild. In one case a parent met criteria for Alcohol Use Disorder, and was included due to being in early remission. One was attending a psychological support group; study inclusion was delayed until the group ended. One reported their child had recently relapsed, however, as treatment had not started, the parent was included.Out of 509 parents identified via the CCR and NAVET, 164 (32.2%) opted out, and 137 provided a response to the multiple‐choice question regarding reasons for non‐participation. Not experiencing any need for psychological support (93/137, 67.9%) was most commonly reported (Table 