What is the scientific and clinical evidence for the effectiveness of residential group activities and therapies in treating depression?/Group Psychotherapy in Residential Settings

Summary

Structured group psychotherapies — particularly cognitive behavioural therapy (CBT) and behavioural activation (BA) — delivered within residential and inpatient settings show consistent evidence of effectiveness for depression. A 2024 quasi-randomised trial of 375 inpatients found both group BA and group CBT produced large reductions in depressive symptoms (d=0.83–1.33), with over half of patients achieving at least 50% symptom reduction. Multiple smaller studies support behavioural activation as a particularly practical intervention for inpatient settings. Evidence is strongest for CBT and BA delivered in groups; weaker for other modalities (psychodynamic, interpersonal) in residential settings specifically.

Cognitive Behavioural Therapy (CBT) in Groups

Melicherova et al. (2024)

Reference: Melicherova U, Schott T, Köllner V, Hoyer J. Behavioral activation for depression in groups embedded in psychosomatic rehabilitation inpatient treatment: a quasi-randomized controlled study. Front Psychiatry. 2024;15:1229380. DOI

This is the largest and most recent study directly comparing group therapy modalities in an inpatient rehabilitation setting:

375 inpatients randomly assigned to group BA (n=174) or group CBT (n=201), embedded within psychosomatic rehabilitation treatment
Both formats showed substantial reduction in depressive symptoms:
- BA group: d=0.83 at end of treatment, d=0.97 at 4–6 month follow-up (BDI-II)
- CBT group: d=1.08 at end of treatment, d=1.33 at 4–6 month follow-up (BDI-II)
- QIDS expert rating: d=1.17 (BA) and d=1.09 (CBT) at follow-up
No significant differences between BA and CBT — both were effective
≥50% symptom reduction achieved by 53.7% (BA) and 54.2% (CBT) of patients
Activation levels (BADS) increased significantly in both groups: d=0.76 (BA), d=0.70 (CBT)
Authors concluded BA is a good alternative to CBT, with lower requirements regarding cognitive abilities and easier implementation

Miller et al. (1989)

Reference: Miller IW, Norman WH, Keitner GI. Cognitive-behavioral treatment of depressed inpatients: six- and twelve-month follow-up. Am J Psychiatry. 1989;146(10):1274–1279. DOI

An early but important RCT:

45 depressed inpatients randomly assigned to:
- Standard treatment only (hospital milieu therapy, pharmacotherapy, clinical management)
- Cognitive therapy + standard treatment
- Social skills training + standard treatment
All treatments began in hospital and continued for 4 months after discharge on an outpatient basis
Significantly higher proportions of patients receiving additional cognitive-behavioural treatment (either CT or social skills) had responded by the end of formal treatment and did not relapse for the remainder of the 1-year follow-up
This study established that adding structured group psychotherapy to standard inpatient care improved both short-term and long-term outcomes

Behavioural Activation (BA) in Inpatient Settings

Behavioural activation — which focuses on systematically increasing engagement in positively reinforcing activities — has emerged as a particularly well-suited intervention for residential and inpatient settings. Its relative simplicity and focus on action (rather than complex cognitive restructuring) make it accessible even to severely depressed patients.

Hopko et al. (2003): Brief BATD Pilot RCT

Reference: Hopko DR, Lejuez CW, LePage JP, Hopko SD, McNeil DW. A brief behavioral activation treatment for depression. A randomized pilot trial within an inpatient psychiatric hospital. Behav Modif. 2003;27(4):458–469. DOI

Pilot RCT within an inpatient psychiatric unit
Brief Behavioral Activation Treatment for Depression (BATD) compared to standard supportive treatment
BATD was significantly more effective than standard treatment
Large effect size demonstrated despite limited sample size
Authors noted BATD is time-efficient and cost-effective, making it practical for managed care inpatient settings

Folke et al. (2015): BA in Acute Inpatient Psychiatry

Reference: Folke F, Hursti T, Tungström S, Söderberg P, Kanter JW, Kuutmann K, Olofsson H, Ekselius L. Behavioral activation in acute inpatient psychiatry: a multiple baseline evaluation. J Behav Ther Exp Psychiatry. 2015;46:170–181. DOI

Multiple baseline single-case experimental design
6 adult inpatients with depressive symptoms and various psychiatric disorders
5-day, 10-session BA protocol added after baseline standard inpatient treatment
At least 4 of 6 participants showed marked gradual improvements in depression and activation when BA was initiated
Change in activation and avoidance either coincided with or preceded decreased depression, supporting the theorised mechanism of BA
Study supports BA as an inpatient treatment for persons with a variety of psychiatric disorders

Kato et al. (2024): BA Delivered by Psychiatric Nurses

Reference: Kato S, Tanoue H, Fukuzoe J, Ishida Y. Brief Behavioral Activation Intervention for Inpatient Depression by Psychiatric Nurses: A Single-Group Study. SAGE Open Nurs. 2024;10:23779608241290717. DOI

15 inpatients received a brief 4-session BA programme delivered by nurses, in addition to usual care
Global Assessment of Functioning (GAF) scores increased significantly from 40.20 to 57.00 (p<.0001)
BDI-II scores improved (25.60 → 22.73 → 22.06) but the change did not reach statistical significance (small sample)
14 of 15 participants completed the programme without feeling burdened
Suggests BA can be feasibly delivered by nursing staff in inpatient settings

Melicherova et al. (2024)

As detailed in the CBT section above, this large study also supports BA delivered in groups as equally effective as group CBT in inpatient rehabilitation settings.

Group Therapy Combined with Other Interventions

Liu et al. (2026): Group Therapy + rTMS for Adolescents

Reference: Liu H, et al. Real-time EEG-triggered transcranial magnetic stimulation combined with group therapy for adolescents with depression and self-harm behavior: A randomized controlled trial. J Affect Disord. 2026;392:120144. DOI

160 adolescent inpatients (12–18 years) with depression and recent self-harm
rTMS + group therapy vs rTMS alone
rTMS + group therapy produced significantly greater HAMD-24 reduction (-14.5 vs -9.8, p<0.001)
Also significant improvements in anxiety (HAMA-14), suicide risk (SPS), and self-harm severity
Demonstrates additive benefit of group therapy when combined with biological treatments in inpatient settings

Group Psychotherapy for Substance Use with Co-Morbid Depression

Much of the residential treatment literature concerns substance use disorders where depression is co-morbid. These studies provide indirect but relevant evidence:

Lo Coco et al. (2019) — Meta-analysis of 33 RCTs of group therapy for SUD in adults. Found significant small effects on abstinence and moderate effects on mental state (including depression) when group therapy was compared to no treatment. PMID: 30797382
Daughters et al. (2018) — RCT of behavioural activation group treatment (LETS ACT) vs supportive counselling in residential SUD treatment. BA group showed significantly higher abstinence rates post-treatment. PMID: 28963853
Polimeni et al. (2010) — 351 clients in a residential therapeutic community showed significant mental health improvements (including depression) after 4 months. PMID: 20887579

Synthesis

The evidence for structured group psychotherapies in residential/inpatient settings is consistent and positive:

Group CBT and BA produce large effects (d≈0.8–1.3) in inpatient rehabilitation settings
BA is particularly well-suited to inpatient settings — simple to implement, effective, and can be delivered by nursing staff
Adding structured group therapy to standard inpatient care improves outcomes beyond medication and milieu alone
Effects are sustained at 4–12 month follow-up
BA and CBT appear equally effective in group formats

The evidence for other modalities (psychodynamic group therapy, interpersonal therapy) in residential settings specifically is thinner, though these modalities have established efficacy in outpatient settings.