Adolescent Psychiatry Inpatients: Self-reported Parent-adolescent Communication Quality and Treatment Outcome

The main hypotheses of the study are:

1a Higher quality of self-reported parent-adolescent communication at baseline is positively associated with higher symptom reduction from baseline (psychiatry admission, t0) to 6 months after admission (t3).

• b Higher improvement of parent-adolescent communication from t0 to t3 is positively associated with higher symptom reduction from t0 to t3.
• Higher quality of self-reported parent-adolescent communication at baseline is negatively associated with consideration of the adolescent's placement outside the family during treatment.

The hypotheses 1a and 1b will be assessed with a linear regression model, hypothesis 2 will be assessed with a logistic regression model.

Covariates that will be taken into consideration are symptom severity at baseline, socioeconomic status of the family, adolescent gender, age, and comorbidity. Sensitivity analyses will be calculated for inpatient treatment duration and outpatient treatment duration after discharge from the hospital.

Symptom severity as the primary outcome is assessed with three measures: YSR (Youth Self-Report), DISYPS-ANG (Diagnostik-System für Psychische Störungen - Angststörungen) and DISYPS-DES Diagnostik-System für Psychische Störungen - Depressive Störungen). The relevant scale will be chosen according to the primary clinical diagnosis: If the primary diagnosis is anxiety (F40-F41), DISYPS-ANG will be used for the primary outcome. If the primary diagnosis is depression (F32-F33), DISYPS-DES will be used. If any other condition is the primary diagnosis, the YSR total scale will be used. Raw values of the DISYPS and the YSR will be transformed into z-values.

Inclusion criteria

• Admission to inpatient care unit of the adolescent psychiatry at the University Medical Center Hamburg-Eppendorf.

Exclusion criteria

• Severe symptom burden at admission
• Lack of knowledge of the German language.