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Study design. N = 92 in-patients enrolled in the study and were randomly assigned to the intervention (IG) or control group (CG). Due to dropouts, missing items in the BDI-II, side effects from medication, illness, artifacts in the ECG, and missing assessments, the final sample size was reduced to 68 for the depression pre–post and to 69 for the HRV pre–post analyses, respectively. Overall, 30 participants (IG = 14; CG = 16) returned the follow-up questionnaires.
