The goal of this experimental interventional study is to learn if the psychological treatment Radically Open Dialectical Behavior Therapy (RO-DBT), is feasible to conduct and provide positive effects for adolescents with eating disorders and emotional overcontrol. Participants will be those at risk for developing severe and enduring eating disorder symptoms, as they have not responded fully to previous treatment attempts. Primary outcomes are feasibility and changes in eating disorder symptoms. Secondary outcomes are changes in unhelpful behaviors and experiences related to emotional overcontrol; including psychological inflexibility, suppression of emotions, and experience of loneliness. The participants will undergo the treatment with RO-DBT, which include an approximately 22 week long treatment consisting of individual psychotherapy and parallel skills training in group.
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Change in eating disorder symptoms measured with Eating disorder Examination Questionnaire (EDE-Q)
Timeframe: At baseline measurement 1 (4-6 weeks before treatment initiation), at treatment completion (on average 24 weeks after treatment initiation), or immediately after the participant decides to end therapy prematurely, and 6 months after the end of treatment.
Change in eating disorder symptoms measured with Eating disorder symptom list (EDSL)
Timeframe: Once each week during the baseline phase (4-6 weeks before the treatment is initiated), once each week during the treatment phase (approximately 24 weeks), and at one timepoint 6 months after the end of treatment.
Change in body mass index (BMI)
Timeframe: Once each week during the baseline phase (4-6 weeks before the treatment is initiated), once each week during the treatment phase (approximately 24 weeks), and at one timepoint 6 months after the end of treatment.
Feasibility - treatment credibility and expectancy
Timeframe: At baseline measurement 1 (4-6 weeks before treatment initiation)
Feasibility - acceptability
Timeframe: Within 1 month after treatment completion (on average 26 weeks after treatment initiation), or within 1 month after the participant decides to end therapy prematurely.
Feasibility - inclusion rates
Timeframe: Before first baseline, during recruitment (typically within one month before enrollment)
Feasibility - drop-out rates
Timeframe: At treatment completion (on average 24 weeks after treatment initiation), or immediately after the participant decides to end therapy prematurely.
Feasibility - Completion of homework
Timeframe: Once each week during the treatment phase immediately after the individual therapy session (approximately 24 weeks).
Feasibility - attendance to sessions
Timeframe: Once each week during the treatment phase immediately after the individual therapy session (approximately 24 weeks).