Provisional posttraumatic stress disorder is associated with greater severity of eating disorder and comorbid symptoms in adolescents treated in residential care.

Objective: Past traumatic events, subsequent posttraumatic stress disorder (PTSD) and related psychiatric comorbidities are commonly associated with eating disorders (EDs) in adults but remain understudied in adolescents.

Methods: Adolescent participants (mean [SD] age = 15.1 ± 1.5 years, 96.5% female) with EDs entering residential treatment (n = 647) at six sites in the United States completed validated self-report assessments of ED, PTSD, major depression, anxiety disorders and quality of life. Provisional DSM-5 PTSD diagnoses (PTSD+) were made via the Childhood Trauma Questionnaire, admission interviews and the PTSD Symptom Checklist for DSM-5.

Results: PTSD+ occurred in 35.4% of participants, and those with ED-PTSD+ had significantly higher scores on all assessments (p ≤ 0.001), including measures of ED psychopathology, major depression, anxiety disorders and quality of life, as well as significantly higher rates of all forms of childhood trauma. Those with PTSD+ also exhibited a significantly higher percent median body mass index for age and sex and a lower propensity toward anorexia nervosa, restricting type.

Conclusions: Results confirm that adolescent patients in residential treatment with ED-PTSD+ are more symptomatic and have worse quality of life than their ED counterparts without PTSD. Integrated treatment approaches that effectively address ED-PTSD+ are greatly needed in ED programs that treat adolescents.