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Efficacy of depression treatments for immigrant patients: results from a systematic review

Abstract

Background

The unprecedented rates of global migration present unique challenges to mental health services in migrant receiving countries to provide efficacious and culturally salient treatment for mental health conditions including depression. This review aimed to identify and evaluate the effectiveness of depression interventions specifically directed towards first-generation immigrant populations.

Methods

We conducted a systematic review of original research published between 2000 and 2013 that investigated depression interventions in first generation immigrants.

Results

Fifteen studies were included; the majority focused on Latino immigrants living in the United States (US). Twelve studies investigated the use of psychotherapies; the remainder examined collaborative care models and physical exercise-based interventions. Cognitive Behavioral Therapy and Behavioral Activation tended to improve depressive symptoms, especially when culturally adapted to suit clients while Problem Solving Therapy improved depressive symptomology with and without adaptations. Collaborative care and exercise did not significantly improve depressive symptoms.

Conclusion

Depression may be effectively treated by means of psychotherapies, especially when treatments are culturally adapted. However the reviewed studies were limited due to methodological weaknesses and were predominantly undertaken in the US with Latino patients. To improve generalizability, future research should be undertaken in non-US settings, amongst diverse ethnic groups and utilize larger sample sizes in either randomized clinical trials or observational cohort studies.

Peer Review reports

Background

Depression is the leading cause of global disability affecting nearly 350 million people worldwide. It disproportionately affects women and at its most severe can result in suicide [1]. Though treatable in primary and acute care settings through a range of psychosocial therapies and medication, less than half those suffering from depression are diagnosed and receive treatment [1, 2].

Migrants are an example of a population group where there is under diagnosis and low treatment of depression [3]. Reasons for this include difficulties in assessment and social stigma associated with depression, variance in depression symptomology, professional nosologies, patterns of help-seeking and self-management see for example [37]. These factors, singularly and collectively, can delay timely diagnosis and treatment for migrants, which is problematic because migrants are a rapidly growing population cohort in nearly all industrialized countries [8]. The current trend of increased global migration as well as the projected rise in mental illness, in particular depression, necessitate forward-planning and strategic service delivery in order to achieve equitable access to mental health services for all.

The challenge currently being faced by health services in immigrant-receiving countries is in planning and delivering appropriate, evidence based, and where possible, culturally salient mental health care to increasingly diverse populations [8, 9]. Unfortunately, the evidence-base that policy makers and service providers may draw on to guide the development of more culturally salient depression treatment interventions is limited in two ways. First, research investigating depression treatment in immigrant populations is sparse and treatment recommendations are largely inferred on the basis of studies done on Caucasian populations [10]. Second, while there is evidence to suggest that culturally framed interventions are effective in treating mental disorders in culturally diverse patient groups [11], it is not clear which specific models and interventions are more (or less) effective in treating depression in immigrant populations [12]. Therefore, this review will systematically identify studies that investigate depression treatments in immigrant populations and evaluate the effectiveness of these treatment strategies/models.

Method

Search strategy

The literature search covered six databases: MEDLINE, PsychINFO, EMBASE, Cochrane Central Register of Controlled Trials, CINAHL and Web of Knowledge. Keywords to identify studies included DEPRESSION (depress*, depressed, depression), IMMIGRANT (immigra*, refuge*, asylum seek*, ethnic minorit*, latin*, migrant*) and TREATMENT (treatment, interven*, therap*). The search was limited to English language peer–reviewed articles published between 2000 and 2013 as we aimed to review the most current evidence.

All articles returned by the database search were screened to assess relevance to the aims and a provisional reference list was compiled. Following the database search, a grey literature search was conducted using Google Scholar and identified studies’ reference lists were also reviewed to identify additional studies of interest. Any relevant references were added to the provisional reference list.

Study inclusion and exclusion criteria

Studies were included if they met the following criteria: (1) they reported original research of either a quantitative, qualitative or mixed methods design, (2) they described a treatment - pharmacological, psychological or otherwise - designed to reduce depressive symptoms, (3) the treatment specifically targeted first-generation immigrant populations, (4) the studies’ participants were 18 years or above and (5) the studies’ participants were diagnosed with depression or met the criteria for depression on a validated depression screening tool administered for the purpose of the study.

Studies were excluded if participants were non-immigrants or second or subsequent generation migrants, under the age of 18, or if comorbidities were reported including other mental illnesses or physical conditions. We excluded second and subsequent generations of migrants because the literature shows that these cohorts are generally more acculturated than first generation migrants and that their health status is very similar to the local population [1315]. Studies that included participants under the age of 18 were excluded. This was done to avoid the additional and unique complexities associated with child and adolescent mental health. Similarly we excluded studies that reported on comorbidities (e.g. cancer and depression) in order to disentangle conclusions about depression treatment from interventions targeting other comorbidities, as these may have added confounding variability in the data presented.

Screening and assessment

1326 potential records were identified (Figure 1). After removing duplicates, reviewing titles and abstracts, 49 records were retained for further assessment. These titles, keywords, abstracts and full-text were then reviewed to assess suitability for inclusion in accordance to the inclusion and exclusion criteria. Based on initial assessment 34 of these 49 records were subsequently excluded [1649] (see Figure 1 for reasons).

Figure 1
figure1

PRISMA flowchart of literature search process.

Fifteen records were included in the final analysis [5064]. The abstracts and full texts of these 15 studies were assessed by two researchers independently. To ensure methodological rigor in the review process, all quasi-experimental and experimental studies were appraised for quality in accordance with the United Kingdom’s National Institute for Health and Care Excellence (NICE) guidelines [65]. Non-experimental studies were assessed using critical appraisal forms adopted from Crombie [66] and used by the Oxford Centre for Evidence Based Medicine, BMJ and Dutch Cochrane Centre [67]. Any disagreement between assessments after full text review was resolved through consensus.

Results

Study characteristics

Of the 15 studies, nine were quantitative [5154, 56, 57, 60, 63, 64], five employed mixed methods [50, 55, 58, 59, 62] and one case study presented qualitative data [61]. Nine studies reported on culturally sensitive/culturally adapted psychological treatments (Table 1). Substantial variation in sample sizes as well as intervention duration across the studies was observed (Table 1). Most studies offered the intervention in the preferred language of the target group or made use of interpretative services (Table 1).

Table 1 Intervention summary and results

Characteristics of the studies’ participants

The major ethnic groups represented in the studies were Latino immigrants living in the United States (US) (53.3%) [51, 5458, 60, 62] followed by Chinese-American immigrants (33.3%) [50, 61, 63, 64]. The remaining studies focused on Chinese-Australians (7.1%) [53], Korean-Americans (6.7%) [52] and Turkish immigrants living in Austria (6.7%) [59].

There was a underrepresentation of men in the included studies; five of 15 studies specifically recruited only women [51, 52, 55, 58, 59], one study reported having no male participants [57] and two case studies did not describe gender as an inclusion criteria but only included female participants [50, 61]. Women, on average, represented 81.2% of the study cohorts, though none of the remaining studies sought to exclude males.

No study specified the nature and reasons for migration of the participants and so we were unable to determine whether migration occurred voluntarily or was forced.

Quality of studies

The reviewed studies were diverse in methodological approaches. In some studies randomization procedures were employed (Table 2) but these procedures were not consistently reported. Although it is generally good practice to have blinded participants and where possible blinded researchers/care providers and assessors, this would not have been feasible in the studies due to the nature of the intervention and the research design used [68]. There were four studies where the research team did ensure that assessors were blinded [54, 6264].

Table 2 Randomized study quality indicators

Depression outcome measures were generally well described, though in a small number of studies details relating to validity and reliability of the outcome measures were not reported [54, 55, 57, 61]. All but one non-experimental study [61] adequately described the interventions being examined as well as control conditions.

The majority of studies reported high attrition rates and missing data handling was generally not well described (Table 2). The most pressing concern regarding missing data handling is the impact that this missing information may have on the direction of the results, hence limiting the generalizability and replicability of the study [69].

Generally, mixed method studies were found to address clearly formulated research questions. It was difficult to ascertain the representativeness of the setting and samples in relation to target populations as most studies recruited participants through various health and community organizations and hence only individuals already engaged with health or community services were included [50, 55, 57, 58, 60].

Although all the studies provided valuable information about depression treatment in immigrant populations, there were methodological flaws that in many cases were identified by the authors themselves. A particular difficulty resonating across experimental and non-experimental studies was the difficulty in recruitment and retention of participants from immigration populations, which in turn resulted in small samples and high attrition.

Interventions and effectiveness

Twelve studies examined the use of psychotherapies either alone, compared to another psychotherapy or waitlist/care as usual conditions. Two studies evaluated the use of collaborative care models and one study investigated the efficacy of a Tai Chi program on depressive symptoms (see Table 3 for qualitative key themes and Table 1 for overview of intervention efficacy).

Table 3 Key qualitative themes

Psychotherapies

Cognitive Behavioral Therapy

Cognitive Behavioral Therapy (CBT) was the most commonly investigated psychotherapy; seven studies evaluated the use of CBT in some form. At the core of CBT is cognitive restructuring, interpersonal skills training and engagement in pleasant activities [70]. Currently, CBT is one of the most extensively researched psychotherapies and is widely used in psychiatry as an acute intervention as well as to prevent relapse for depression [7173]. Although CBT can be delivered by a therapist to an individual or a group, more recently internet and/or phone delivered CBT interventions have become increasingly popular [74].

Studies evaluating CBT varied widely in the method of intervention delivery. Dwight-Johnson et al.[54] and Choi et al.[53] assessed the efficacy of culturally adapted CBT delivered by phone and internet respectively in randomized trials in which bilingual therapists and translated materials were utilized. Choi et al.[53] observed significant reductions in depressive symptoms in Chinese patients on both the Chinese Beck Depression Inventory (CBDI) and Patient Health Questionnaire-9 (CB-PHQ-9) depression items with only marginal drop-out rates reported. The reported with-in and between-group effect sizes (Cohen’s d) were 1.41 and .93 on the CBDI and .90 and .50 on the CB-PHQ-9 respectively. Conversely, Dwight-Johnson et al.[54] only reported a positive trend towards improvement on the Hopkins Symptoms Checklist (SCL) and on the PHQ in Latino participants; however their study was limited because only 44% of participants completed six or more sessions of the eight session intervention (a limitation that they acknowledge).

Two studies investigated therapist-delivered, culturally adapted CBT delivered in participants’ first language [56, 61]. Interian et al.[56] employed a 12-week culturally adapted CBT intervention that was found to be effective in decreasing depressive symptoms in a small sample (n = 15) of Hispanics suffering major depression, immediately post treatment (effect size 2.71) and at the 6 month follow-up point (effect size 2.53). Tang et al.[61] reported on the use of CBT to treat depressive symptoms in an elderly Chinese caregiver in a single case study, in which 16 sessions were conducted in Cantonese over five months, which resulted in a decrease in depression scores on the Geriatric Depression Scale (GDS) and greater patient satisfaction with interpersonal relationships.

A group CBT paradigm based on a treatment manual developed by Muñoz et al.[70] specifically for Hispanics was examined by Gelman et al.[55] and Piedra et al.[58] in pre-post and pre/post/follow-up studies respectively. In both studies, therapists were fluent in English and Spanish. Piedra et al.[58] reported significant improvement at post-test with effect size of r=.67. This concords with findings of Gelman et al.[55] who reported an average decrease in Beck Depression Inventory-Spanish (BDI) scores of 12 points (p = .01). Qualitative results from both studies suggested great patient satisfaction with the treatment (Table 3).

In a randomized controlled study, Renner et al.[59] compared an interpreter-assisted CBT group (intervention) and a self-help group (intervention) facilitated by female, Turkish native speakers to a waitlisted group of Turkish immigrant women (control). The interventions proved ineffective in addressing depressive symptomology. However, this study did not employ a CBT protocol adapted to the target population and therapy sessions were conducted by an Austrian therapist assisted by an interpreter. Qualitative results indicated that participants across both interventions experienced increased mutual trust within the group environment, learned problem solving strategies and felt more emotionally resilient. However, they also indicated a preference for “real therapy” i.e. one-on-one sessions with a senior clinician (Table 3). While the intervention was unsuccessful, the study was well-described and executed and highlighted important factors (e.g. use of culturally salient interventions delivered by ethnic psychotherapist) that may facilitate successful interventions in future research in the target population of the study.

Other psychotherapeutic interventions

Culturally adapted Behavioral Activation for Latinos (BAL) delivered in participant’s preferred language was evaluated in a pilot study that reported a decline in depressive symptomology over the study period of 20 weeks with large effect sizes on BDI-II (d = 1.07) and HRSD (d = 1.43). However, as reported by the study author, these results have to be interpreted with caution as the sample was very small, attrition rates were high and follow-up data was lacking [57].

Chu et al.[50] introduced a framework (Formative Method for Adapting Psychotherapies (FMAP)) for adapting evidence based interventions to diverse cultural groups. This framework was utilized to create Problem Solving Therapy—Chinese Older Adult (PSTCOA) that was piloted tested with a clinically depressed elderly Chinese woman who engaged in a 12-week program delivered in English. The intervention resulted in a decrease in depressive symptoms to sub-clinical levels and improvement in self-reported mood following 12 weeks of therapy; however no further follow up was reported. Although not described in detail, the qualitative data suggested that the intervention was acceptable to the client.

Schmaling et al.[60] likewise reported significant improvement in depression scores in Mexican Americans as a result of time-limited Problem Solving Therapy for Primary Care (PST-PC), delivered by bilingual therapists, in a dose-dependent manner; four or more PST-PC sessions resulted in greater reduction in Hopkins Symptom Checklist-20 (HSCL-20) scores relative to three or less PST-PC sessions (t (85) = -2.54, p = .05). Interestingly, while the treatment resulted in improvement in depression symptoms, it was not culturally adapted but rather provided as a generic intervention applicable to all cultural groups. Although a reasonable sample size was obtained, the lack of control group and attrition are limitations [60].

Beeber et al.[51] conducted a randomized controlled trial examining a short-term, in-home intervention using time limited, culturally tailored Inter-Personal Therapy (IPT) to reduce depressive symptoms in Latina mothers. The intervention involved over 11 in-home sessions with a psychiatric nurse and interpreter and five short booster sessions delivered by an interpreter. The intervention significantly reduced depressive symptoms compared to care as usual on the Center for Epidemiologic Studies Depression Scale (CES-D) measured across four time points. These sustained mean differences in CES-D scores were 4.1 points (p = .08) at T2, 8.3 points (p < .01) at T3, and 6.1 points (p = .04) at T4. However, the control group also experienced an improvement, which the authors attribute to the enhanced care of all participants. Qualitative results indicated participant satisfaction with the model, even when using an interpreter.

Cho et al.[52] employed the novel intervention logo-autobiography (LA) as a treatment modality for depression in Korean immigrant women. LA, based on Frankl’s existential psychology, incorporates autobiography as a therapeutic tool. It was found to be effective in reducing depressive symptoms in experimental groups relative to control groups immediately following the intervention and at the four week follow-up (F =6.832, p = .013; F =19.800, p ≤ .001); LA was in particular efficacious in non-medicated patients. It should be noted that patients were allowed to choose their own treatment conditions, which significantly affected the validity of results.

Collaborative care models & exercise intervention

A small number of studies investigated the potential of using collaborative care models. Research in primary care settings has found a positive link between collaborative care and improvement in mental health care outcomes, including depression [75]. While most agree collaborative care is important and effective in patient management, the evidence is divided on the effectiveness of care management components for depression. This is highlighted in the study by Kwong et al.[33] that showed no advantage of adding a care management component relative to enhanced physician care in depressive symptomology.

Yeung et al.[64] investigated the feasibility of using a collaborative care model adapted to a cohort of depressed Chinese Americans using bilingual care managers in a randomized trial where the active phase ran over period of 24 weeks. There was a decrease in depressive symptoms in both control and intervention groups, but there was no significant difference between the groups. This could potentially be due to the fact that all participants were encouraged to speak to a mental health professional and many did engage in treatment regardless of group allocation, highlighting the potential of collaborative care models in engaging immigrants in mental health care.

In a smaller pilot randomized trial Uebelacker et al.[62] implemented a phone-based care management program with a stronger focus on depression assessment in the language of the participants and goal setting for Hispanic patients over a period of 12 weeks. Results only rendered a non-significant trend towards improvement in symptomology in the intervention group. Methodologically, the study was well designed but was limited by recruitment difficulties resulting in small sample size. In addition, there was limited participant engagement in the actual intervention with an average utilization rate of 1.7 phone calls out of 8 phone calls across the intervention group. The qualitative data suggested a mixed reception by participants, who on one hand felt the intervention was helpful, but on the other hand, thought it could have improved with face-to-face contact (Table 3).

In a unique study by Yeung et al.[63], the feasibility and efficacy of using Tai Chi to treat depressive symptomology in a Chinese-American cohort over a 12 week period was examined. The intervention was facilitated in Chinese and while results did show positive trend in remission rates, further research with larger sample is required to substantiate the results.

Discussion

This review sought to identify the current literature on depression treatments and to evaluate the effectiveness of these treatments in first-generation immigrant populations. In recent years, the need for research of culturally salient interventions for mental health problems in ethnically diverse populations has been highlighted in the literature [76, 77].

To date the majority of clinical research is still based on western, middle class, educated individuals and there is a dearth of studies on ethno-cultural groups [9]. This is reflected in the in the current review; while many high-quality studies were identified, the scope and breadth of available research is limited and under-representative of ethnic diversity and geographic locations.

Further, it is interesting to note that no pharmacological interventions were identified in our search considering that racial and ethnical differences may influence drug responses, which in turn relates to efficacy of medication prescribed for depression [10].

In our review a number of interventions were assessed including seven studies using CBT in a diverse range of treatment paradigms with mixed results. We conclude that culturally adapted psychotherapies and some non-culturally adapted therapies may have offered therapeutic benefits to immigrant populations assessed (primarily US-based Latino females). However, it was not possible to ascertain whether there was greater adherence to culturally adapted interventions relative to non-adapted interventions that were implemented in migrant populations; Renner et al.[59] reported that their non-culturally adapted CBT was not well-accepted in Turkish migrant women, whereas Schmaling et al.[60] implemented non-culturally adapted PST-PC in a Mexican sample with positive outcomes. So while there is growing interest in adaptation of interventions [12], it still remains to be determined whether or not culturally adapted interventions are more acceptable to migrants populations.

In the general population collaborative care models for depression have been shown to be successful in reducing depressive symptoms [78, 79], yet the collaborative care studies [62, 64] reviewed did not yield a significant effect on depressive symptoms relative to usual care. Similarly, while exercise has long been advocated as an effective treatment modality for depression [80] and a recent study recent study by Lavretsky et al.[81] showed the positive effects of Tai Chi on depression when complimenting anti-depressants, the Tai Chi study by Yeung et al.[63] only indicated a positive trend towards amelioration of depressive symptoms.

Research implications

The generalizability of findings reported in the reviewed literature to other settings and ethnic groups is limited as sample sizes were generally small, some studies reported high attrition rates and the range of ethnic populations included in the studies was narrow. In addition, six of the 15 reviewed studies employed single group designs that can pose a threat to internal validity by overestimating the effectiveness of the intervention [82]. There was also insufficient reporting on processes for dealing with missing data in many studies and this further restricted the studies’ generalizability.

While the reviewed literature rendered mixed results about the efficacy of a number of psychotherapies, replication and extension of the current body of knowledge is needed including comparisons of the efficacy and acceptability of adapted with non-adapted interventions. For example, while there may be insufficient evidence that Tai Chi in its own right is an efficacious intervention for depression based on the results reported by Yeung et al.[63], prior research has provided support for the positive effects of physical exercise [80], including Tai Chi [81], on mental health including depression. Therefore further research of treatment paradigms that include Tai Chi as an adjunct treatment to medical or behavioral interventions, in migrant and non-migrant populations alike would extend the current knowledge base.

Additionally, while neither of the collaborative care studies reviewed could offer definitive results on the efficacy of their interventions, it may still be a worthwhile avenue for future research in migrant populations, especially given the success of collaborative care models on reducing depressive symptoms in the broader population; it is an avenue worth pursuing in future studies in migrant populations.

Regardless of the intervention of choice, future research should be cognizant of the research design and methods employed. In the current review only a small number of RCTs and pilot RCTs were identified across the different interventions, but further replication and extension of the current research by means of rigorous randomized clinical trials would significantly improve the current scientific evidence base. While this may not always be feasible for ethical or funding reasons, even replication of findings in larger, non-clinical trials can improve the cumulative body of knowledge. In addition, our review also accentuates the need for further research investigating depression treatment in first generation immigrants across ethnic groups and in diverse settings, not only limited to US-based studies.

Limitations

Several limitations to the present review must be acknowledged. Importantly, the review only included peer-reviewed articles published from 2000 to early 2013 and while the utmost care was taken to perform a thorough search, the possibility that evidence might have been missed cannot be excluded. Further, as studies in which comorbidities were reported were excluded, it is possible that some evidence may have been missed through the selection process. In addition, as only English articles were included research published in other languages were excluded. Lastly, only studies investigating first-generation immigrant populations were included whereas the body of literature investigating ethnic minorities is much broader.

Conclusion

To the best of our knowledge this is the first review to examine and evaluate the evidence on depression treatments in immigrant populations. As our review demonstrates, culturally-adapted CBT as well as other psychotherapies do hold considerable promise in reducing depressive symptoms in first-generation immigrant populations.

However, while our review accentuates the need for further research investigating depression treatment in first generation immigrants, we recognize that it is simplistic to merely call for further research to extend on the current body of knowledge. Researchers may want to improve conditions for migrant populations but face several barriers to undertaking this kind of work. As suggested by Minas [83] ethnic diversity and the mental health needs of immigrants that may differ from mainstream populations is still to permeate the consciousness of policy makers and major funding bodies. In addition, there is a tendency to relegate communities to “other” status, deviating from “whites” placing immigrants into “special needs” categories rather than viewing them as an integral part of the population who effectively are not having their mental health needs met [84, 85]. Therefore, in order to broker greater collaboration between and within research institutions to validate existing knowledge and generate new evidence to address issues relating to immigrant mental health, research efforts need to be supported by policy and funding. Only then can we begin to develop effective evidence-based clinical and care interventions to meet the needs of population groups from increasingly diverse immigrant backgrounds.

This study did not require ethical approval.

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Acknowledgements

JA was funded to undertake this research by an Australian Postgraduate Award. BB is financially supported by a fellowship from the Australian National Health and Medical Research Council.

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Correspondence to Josefine Antoniades.

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The authors declare that they have no competing interests.

Authors’ contributions

BB and JA designed the review, collected and analyzed data and wrote the first draft of the paper. DM contributed to the design and subsequent stages of the write up. All authors read and approved the final manuscript.

Josefine Antoniades, Danielle Mazza and Bianca Brijnath contributed equally to this work.

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Antoniades, J., Mazza, D. & Brijnath, B. Efficacy of depression treatments for immigrant patients: results from a systematic review. BMC Psychiatry 14, 176 (2014). https://doi.org/10.1186/1471-244X-14-176

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Keywords

  • Migrant
  • Depression
  • Intervention
  • Review