Modelling trajectories of change in psychopathology and well-being during eating disorder outpatient treatment

Jan Alexander de Vos*, Mirjam Radstaak, Ernst T. Bohlmeijer, Gerben J. Westerhof

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

5 Citations (Scopus)
88 Downloads (Pure)


Objective: There are considerable differences in how eating disorder (ED) patients respond to treatment. This study aimed
to identify change trajectories of mental health during treatment. Method: Longitudinal data of 442 patients was used with
five time points during a year of outpatient treatment. ED psychopathology and well-being were used as primary measures. A series of latent growth mixture models were applied to model trajectories of change. Results: Three latent classes were found for ED psychopathology and well-being. For ED psychopathology, a high baseline severity and slow recovery class (55.9% of the patients), a high baseline severity followed by a substantial recovery class (19.9%) and a moderate baseline severity and no significant recovery class (24.2%) were found. For well-being, a low baseline followed by a slow growth class (44.6%), a low baseline and substantial growth class (9.5%) and a moderate and stable well-being class (45.9%) was found. General psychopathology, early symptom change, hope for recovery, intrinsic motivation and the ED type were predictive of class membership in either ED psychopathology or well-being. Conclusions: This study shows variability in ED psychopathology and well-being change trajectories, modelled in meaningful latent recovery classes. These results may
have clinical implications, such as adjusting patients’ treatment based on change trajectories.
Original languageEnglish
Pages (from-to)415-427
Number of pages13
JournalPsychotherapy Research
Issue number4
Early online date4 Nov 2022
Publication statusPublished - 19 May 2023


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