Abstract
We aimed to map the evidence, based on population-based and migrant-specific datasets in Switzerland, on mental health and wellbeing of the population with migrant background. The research questions were: What is known from the existing quantitative evidence about the mental health of the population with migrant background living in Switzerland? What are the research gaps that can be addressed with existing secondary datasets in Switzerland? We used the scoping review approach to describe existing research. We searched Ovid MEDLINE and APA PsycInfo (2015 - September 2022). This resulted in a total of 1862 potentially relevant studies. In addition, we manually searched other sources, such as Google Scholar. We used a evidence map to visually summarise research characteristics and identify research gaps. In total, 46 studies were included in this review. Most studies used cross-sectional design (78.3%, n = 36) and theirs aims were descriptive (84.8%, n = 39). The studies tend to examine mental health or wellbeing of the population with migrant background in the context of social determinants (69.6%, n = 32). The most frequently studied social determinants were at the individual level (96.9%, n = 31). Out of 46 included studies, 32.6% (n = 15) included depression or anxiety, and 21.7% (n = 10) post-traumatic stress disorder and other traumas. Other outcomes were less commonly investigated. There was a lack of studies using longitudinal data investigating mental health of migrants that go beyond descriptive aims (i.e., explanatory and predictive), and have large nationally representative samples. Moreover, there is a need for research examining social determinants of mental health and wellbeing at the structural, family and community levels. We propose that existing nationally representative population-based surveys are used to a greater extent to study various aspects of migrants’ mental health and wellbeing.
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Background
Switzerland is a country with the third-largest proportion of migrants in Europe (defined as population with foreign citizenship), after Luxembourg and Lichtenstein, with 2.1 million people (25% of the whole population), with majority from Eropean Union, European Free Trade Association states or the United Kingdom [1]. The migration population of Switzerland is very diverse, with large numbers of refugees from war-torn countries, such as former Yugoslavia, as well as, highly educated labour migration mainly from European countries [1]. The war in Ukraine and global warming are likely to lead to increased migration in near future. Hence, the United Nations 2030 Agenda for Sustainable Development calls for actions to build equitable and inclusive societies allowing the migrant population to fulfil their potential [2]. Migrants have a right to health and good health is essential to work, be productive and contribute to social and economic development. Migrants tend to disproportionally suffer from mental health problems, having also greater barriers to accessing mental health services. Therefore, it is important to better understand which migrant groups and migration life trajectories are particularly vulnerable to mental health problems and why.
Systematic reviews consistently show worse levels of mental health and wellbeing among migrants than non-migrants across different countries, with depression and anxiety being the most common problems in the migrant population [3]. The most comprehensive estimates of point prevalence of depression and anxiety are 38.99% (with a 95% confidence interval ranging from 27 to 51%) and 27.31% (6–58%), respectively [4]. Migrant workers also tend to experience other issues such as alcohol or substance abuse and poor sleep quality to a greater extent than the general population [3].
The risk factors for poor mental health identified in international systematic reviews are similar to the ones found in the general population, however, migrants may be affected by them to a greater extent. These included poor physical health, family history of psychiatric disorder, poor coping skills, workplace stressors, poor working conditions, limited access to healthcare, duration of residence, living conditions and limited social support [4]. Factors that were more unique to migrants include discrimination based on origin, and, partially because of that, employment in jobs for which they are overqualified or reliance on precarious employment [5]. However, it is important to emphasise that migrant population is highly diverse in Switzerland. It ranges from, mainly European, highly qualified, migrant workers, to the most vulnerable populations such as asylum seekers or refugees. Switzerland is also home to an estimated 90,000 undocumented migrants who live in precarious conditions [6]. Hence, the social determinants of mental health and wellbeing are likely to be very different in these highly heterogenous groups. One of the challenges of research on migrants’ mental health is to ensure that the available data capture the diversity of migrant population, providing generalisable information. Somewhat unexpectedly, the systematic reviews cited here did not identify any studies conducted in Switzerland after 2015. This is despite Switzerland having several representative population-based datasets with a large proportion of the migrant population. There are several potential reasons for this omission, other than simply a lack of research conducted in this context in Switzerland. First, Switzerland is a multi-lingual country, with some research potentially being published in a non-English language. Second, a lot of descriptive information about major social issues, such as migration, is provided by the Federal Statistical Office (FSO), rather than journal publications. This is in the format of online reports, which may not be picked up by academic search engines or Google Scholar. Thirdly, the definition of migrant population might be often too narrow to capture Swiss studies. Namely, a lot of studies define migrants as, for instance, residents of a given country without citizenship. However, in Switzerland, the definition of migration, from the academic and policy perspective, tends to be wider, including ‘population with a migration background’, which comprises not only the nationality and country of birth of individuals but also that of their parents [1]. Such a conceptualisation is based on the international recommendations by the United Nations Economic Commission for Europe and is in line with the topology proposed by the Federal Statistical Office [1, 7]. The main limitation of the literature identified by these systematic reviews was a reliance on cross-sectional studies. This is not necessarily a limitation for descriptive studies, which aim to estimate the prevalence of mental health problems. However, a cross-sectional design is inadequate for predictive and explanatory aims.
There is great potential in the observational data in Switzerland, for instance, the Swiss Household Panel, to study mental health of migrants. The strength of the Swiss data in the European context is that it includes a relatively large number of migrants, representative of the migrant population. This is at odds with, for example, datasets in Great Britain, where the observational studies tend to include mainly white, nationally born participants.
Hence, the overarching aim of this review is to describe and map the current evidence on mental health of the population with migrant background in Switzerland and to identify knowledge gaps in the area. We aim to review three types of studies investigating mental health of the population with migrant background in Switzerland, using population-based and migrant-specific datasets: descriptive, predictive and explanatory [8]. Descriptive studies assess mental health of migrants, compare their mental health to non-migrant or general population or identify subgroups of migrants with particularly good or poor mental health. For instance, they may uncover whether prevalence of mental health problems varies according to a region of origin, sex, or socioeconomic group. Predictive studies aim to estimate individual risk of having poor mental health among migrant groups, that is, they help to identify individuals at increased risk of mental health problems. This could inform more targeted interventions, for instance, focused on the most vulnerable groups. However, these studies cannot tell us anything about mechanisms that translate migration into poorer mental health, as they do not consider the causal structure of the relationship between migration and mental health. Such mechanisms can be uncovered by explanatory studies, which try to answer questions related to how or why migration is associated with worse mental health outcomes. As migration cannot be randomised, a potential intervention can be identified through carefully designed observational studies.
Method
The scoping review was deemed to be relevant for the purpose of our study, which was to describe the available evidence in the field of migrants’ mental health in Switzerland and identify knowledge gaps to inform future research [9]. As recommended, the design of this scoping review follows five stages: (1) identifying the research question, (2) identifying relevant studies, (3) study selection, (4) charting the data, (5) collating, summarising and reporting the results [10]. The protocol for the review was not pre-registered, as we aimed to identify and map relevant studies, rather than report their findings or assess their quality. Hence, there was no bias that a protocol could help to minimise, for instance, an elevated risk of false positive results.
Identifying the Research Question
Our research questions were: What is known from the existing quantitative evidence about the mental health of the population with migrant background living in Switzerland? What are the research gaps that can be addressed with existing secondary datasets in Switzerland?
Identifying Relevant Literature
The potentially relevant studies were first identified through a search in electronic databases. The key concepts of the search were ‘mental health and wellbeing’, ‘migration’ and ‘Switzerland’. The terms for each of these concepts were combined with OR and the concepts were combined with AND Boolean operators. The search was conducted in Ovid MEDLINE and APA PsycInfo, using Ovid platform, on the 4th of October 2022 with date limits of publication 2015–4th week of September 2022 (see eTable 1 for the exact search strategy). The included manuscripts were published in 2015–2022, however the data used in these studies might have been collected earlier. One study was published twice, in 2014 (in English) and 2016 (in German: Forum der Psychoanalyse: Zeitschrift fur klinische Theorie & Praxis. Vol.32(2), 2016, pp. 135–149) [11]. Our search picked up the 2016 manuscript, but as we found an English version published two years earlier, we decided to keep the study in.
The search resulted in a total of 1862 potentially relevant studies. In addition, we searched (1) reference lists of included studies, (2) lists of studies conducted by Swiss research organisations (Federal Statistical Office, LIVES Centre, Swiss Foundation for Research in Social Sciences), (3) relevant academic journals (Swiss medical weekly, Journal of immigrant and minority health, Ethnicity and health), (4) Google Scholar.
Study Selection
The study selection is graphically presented by the flow diagram (Fig. 1). The abstracts and titles of 1862 potentially relevant publications, identified through electronic databases search, were screened for exclusion criteria by the first reviewer (NW), which were (1) qualitative design, (2) population with migrant background not included, (3) mental health or wellbeing outcome not included, (4) not published in English or French, (5) not conducted in Switzerland, (6) published before 2015 (see Table 1 for an explanation of each criterion). Any uncertainty about whether a given study should be excluded was discussed by the first and second reviewers (NV and DG). This resulted in narrowing the number of potentially relevant studies to 224. The full texts of these publications were retrieved and screened again, following a similar process as above, by the first reviewer (NV) who selected 75 potentially relevant texts. After screening by the second reviewer (DG), 41 studies were included. The manual searches resulted in adding five more studies. In total, 46 studies were included in this review.
Charting the Data
The data were extracted from all included studies by the first reviewer (NV), with 20% of the studies also reviewed independently by the second reviewer for the comparison in consistency in extracted information. Any discrepancies were resolved by discussion. The information was extracted and organised using a pre-specified form, created in Microsoft Excel (see eTable 2). The studies were classified into descriptive, predictive or explanatory [8].
The social determinants examined by the studies, for instance as predictors of mental health among migrants, were classified according to the conceptual framework for public mental health, recently developed by Dykxhoorn and colleagues [12]. This comprehensive framework proposes 55 key determinants organised into four levels: individual (e.g., sociodemographic, physical health), family (i.e., family structure and dynamics), community (i.e., social, geographical and physical environment), and structural (e.g., norms, rights, government and political) [12].
Collating, Summarising and Reporting the Results
As typically in scoping reviews, we descriptively present the key characteristics of the collated evidence, with the focus on mental health of the migrant population in Switzerland. We use evidence maps to visually summarise research characteristics, which helps to identify potential gaps in the literature [13].
Results
Characteristics of the Included Studies
The aggregated characteristics of the included studies can be found in Fig. 2 and the characteristics of individual studies in eTable 2. The majority of studies used cross-sectional design (78.3%, n = 36) and their aims were descriptive (84.8%, n = 39). Most commonly researchers would collect the data for the study (referred to as ‘primary data collection’; 63.0%, n = 29), with others using existing secondary (19.6%, n = 9) or use administrative information (17.4%, n = 8). The studies relying on primary data collection would typically target selective, hard-to-reach, migrant groups, such as refugees or asylum seekers [11, 14,15,16,17,18,19,20]. Hence, most included studies had a sample size of under 200 participants (65.2%, n = 30) and covered narrow geographic areas such as individual cities or cantons (78.3%, n = 36).
Among nine studies that used secondary data, the datasets included the Swiss Health Survey (n = 2) [21, 22], the Swiss Household Panel (n = 1) [23], Swiss Youth Mental Health Literacy and Stigma Survey (n = 1) [24], Swiss Labour Force Survey (n = 1) [25], Gesundheitsmonitoring der Migrationsbevölkerung in der Schweiz (n = 1) [26], Swiss Multicentric Adolescent Survey on Health (n = 1) [27], two studies did not specify the sources of the secondary data [20, 28]. Nine studies used administrative data, taking advantage of medical electronic records available within hospital statistics [15, 18, 29,30,31,32,33,34]. The basic characteristics of these studies varied widely (e.g., age category, sample size, mental health outcomes; see eTable 2 for details). However, they were all limited to narrow geographical regions and all but one of them were cross-sectional [32].
Majority of the included studies comprised mainly adults (84.8%, n = 39), with a few being focused on children (6.5%, n = 3) or adolescents (8.7%, n = 4) only. About half of the studies included refugees or asylum seekers (52.2%, n = 24), one-third included first or second-generation migrants (32.6%, n = 15), and the rest comprised a combination of various migrant groups (15.2%, n = 7) – e.g., undocumented or with unspecified migration background. Most studies made comparisons of migration subgroups (76.1%, n = 35). For instance, the researchers compared first and second-generation migrants [27] or undocumented and regularised migrants [23].
Social Determinants and Mental Health – Evidence map
Figure 3 provides a visual representation of the distribution of social determinants and mental health outcomes examined by the included studies. More details regarding individual studies can be found in eTable 2. Most studies examined mental health or wellbeing of the population with migrant background in the context of social determinants (69.6%, n = 32). Over half of these studies included more than one type of social determinant (e.g., individual and family) (53.2%, n = 17). The most examined social determinants were at the individual level, with nearly all studies having one determinant from that group (96.9%, n = 31). The determinants at the family, community and structural levels were included in a similar number of studies (family: 28.2%, n = 9; community: 25.0%, n = 8; structural: 21.9%, n = 7). The social determinants were mainly examined as exposures (‘independent variables’) (78.1%, n = 25), with other studies defining them as effect modifiers (12.5%, n = 4), mediators (6.3%, n = 2) or a combination of exposures and mediators (3.1%, n = 1).
Out of 46 included studies, 32.6% (n = 15) included depression or anxiety, 21.7% (n = 10) PTSD and other traumas. Other outcomes were less commonly examined: psychological distress (10.9%, n = 5), wellbeing (8.7%, n = 4), mental healthcare utilisation (6.5%, n = 3). A large proportion of studies used various other outcomes (28.3%, n = 13), such as externalising problems [35], or any psychiatric disorder [15, 30,31,32, 36].
The most visible gap in the current evidence is a dearth of studies using longitudinal design (Fig. 3). Moreover, structural social determinants have been rarely investigated across any mental health or wellbeing outcomes, whereas family and community factors have been virtually not examined in the context of psychological distress or wellbeing.
Discussion
The key strength of the research on mental health and wellbeing of populations with migrant background in Switzerland is relatively rich evidence on asylum seekers and refugees, typically hard-to-reach groups. However, these studies tend to rely on a cross-sectional design, small samples or narrow geographical regions.
The key evidence gaps include a dearth of studies with a longitudinal design, going beyond descriptive aims (i.e., explanatory and predictive), and with large nationally representative samples. Moreover, there is a need for research examining structural social determinants of mental health and wellbeing as well as family and community factors in the context of psychological distress and wellbeing.
Research Recommendations
In this section, we provide recommendations for how the aforementioned evidence gaps can be addressed using existing secondary datasets and administrative data, which have been underused in the Swiss context. In Table 2, we give brief information on major population-based datasets in Switzerland, which can be used to address the identified evidence gaps.
Despite numerous existing descriptive studies, there is still a need for country-wide research, which would provide representative prevalence or incidence of common mental health problems. For instance, the Families and Generations Survey and Swiss Health Survey could be used to provide information on the potential differences between Swiss and foreign populations in psychological distress, depression and wellbeing. As these surveys are designed to produce representative values for cross-sections of Swiss society at regular time intervals, they can shed the light on changes over time in mental health and wellbeing across various migrant groups, e.g., according to their demographic characteristics.
The longitudinal datasets, such as the Swiss Household Panel or European Social Survey (see Table 2), are best suited to conduct predictive (e.g., who is at a higher risk of future mental health problems?) or explanatory studies (e.g., why certain groups are at a higher risk of mental health problems?). These surveys include a wide range of social determinants, at the individual, family, community and structural levels – hence, can expand on the current research mainly focusing on individual social determinants. Moreover, they collect information on psychological distress and wellbeing, which have been particularly understudied. The Swiss longitudinal surveys tend to include geographical identifiers, which allow for studying the impact of structural determinants, such as unemployment or provision of mental health services, at the municipal or cantonal level.
The existing datasets share certain strengths and limitations. They have large sample sizes, are representative of Swiss society, including both native and migrant populations, and have a plethora of various social determinants. The longitudinal studies allow for building complex statistical models, in which the temporal relationships between variables can be explored, potentially uncovering causal structures between migration and mental health or wellbeing. However, these datasets tend to rely on self-reported indicators of psychological distress or wellbeing, rather than clinical information about one’s mental health.
The migrant populations in existing databases are often limited to foreign nationals, who tend to be economic migrants. This is a dominating migration group in Switzerland, with nearly 2 million persons, constituting vast majority of overall migrant population and about 27% of the working-age population in Switzerland [1]. Despite this population being relatively well off, it is still likely to be disadvantaged compared to native-born individuals [40]. The employment rate among economic migrants is still below that of native-born and economic migrants live in greater uncertainty, to some extent due to being dependent on work permits [40]. Also, labour migrants, mainly from countries outside the Organisation for Economic Co-operation and Development, are often underemployed and migrant mothers have limited access to active labour market policy tools [37]. Overall, this makes migrant workers susceptible to mental health and wellbeing problems. Due to the large size of this population, it is important for public health to understand how mental health of this population can be protected. The available large population-based datasets are well-suited to study this population, and the findings are likely to be highly generalisable to other European countries with a sizeable proportion of migrants in the labour force.
Unfortunately, the most vulnerable individuals, such as refugees or asylum seekers are not included in these surveys. These migrant groups, however, are often targeted by primary surveys, as found by our review. This shows that there is substantial interest in Switzerland in mental health and wellbeing of this population. However, these primary surveys may not be representative for vulnerable migrant populations, as they are hard to recruit and follow over time. Moreover, small sample size of the existing studies limits their usefulness in more complex statistical analyses. However, combining and harmonising these datasets could help to obtain larger sample sizes and improve their generalisability. Our study could help to identify research groups that hold access to these data and could facilitate the efforts to maximise their use. But it has be highlighted that aggregating collected data is a challenging process due to multiple methodological differences in the recruitment of participants or used surveys.
Finally, large population-based surveys have some common methodological challenges, such as widespread, non-random, missing information due to dropout or non-response [38]. Potential biases due to missing information can be mitigated to some extent by using various imputation methods [39].
Limitations of the Review
There are several limitations of this review. Firstly, we only included studies published in English and French. Other languages, such as German and Italian are also spoken in Switzerland, hence local reports written in these languages might have been missed. Peer-reviewed publications and national reports were unlikely to be written only in either of these languages, however it is possible that we might have omitted small-scale studies, conducted on a regional level We do not believe that the overall interpretation of the identified evidence gaps would change drastically (e.g., that family-level social determinants have been rarely examined).
Secondly, our search was limited to two major electronic databases – Ovid MEDLINE and APA PsycInfo. As this search resulted in many studies that did not meet inclusion criteria, we devoted more resources to hand searches of relevant journals and publications list of national research organisations. We found only a few additional studies (n = 5) through a hand search, hence providing evidence for the main search being comprehensive. Future reviews could also consider qualitative evidence, which would be particularly useful in theory generation for predictive and explanatory studies in the context of wellbeing and mental health of migrants.
Conclusion
There is a relatively large amount of evidence on mental health and wellbeing of asylum seekers and refugees, hard-to-reach groups. However, these studies tend to rely on a cross-sectional design, small samples or narrow geographical regions. There is a lack of studies using longitudinal data, going beyond descriptive aims (i.e., explanatory and predictive), with large nationally representative samples. Moreover, there is a need for research examining structural social determinants of mental health and wellbeing, as well as family and community factors in the context of psychological distress and wellbeing. We propose that data already collected through large, nationally representative population-based surveys are used to a greater extent to examine various aspects of migrants’ mental health and wellbeing.
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Acknowledgements
This publication benefited from the support of the Swiss National Centre of Competence in Research LIVES – Overcoming vulnerability: Life course perspectives (NCCR LIVES), which is financed by the Swiss National Science Foundation (grant number: 51NF40-185901). The authors are grateful to the Swiss National Science Foundation for its financial assistance. We would like to also thank Noémie Vanoli for her help with searching the articles.
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Conceptualization: [Dawid Gondek, Laura Bernardi]; Methodology: [Dawid Gondek, Laura Bernardi]; Formal analysis and investigation: [Dawid Gondek]; Writing - original draft preparation: [Dawid Gondek]; Writing - review and editing: [Dawid Gondek, Laura Bernardi]; Funding acquisition: [Laura Bernardi]; Resources: [Laura Bernardi]; Supervision: [Laura Bernardi].
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Gondek, D., Bernardi, L. Mental Health and Wellbeing of Population with Migrant Background in Switzerland – a Scoping Review and Evidence Map of Quantitative Evidence. J Immigrant Minority Health 25, 1108–1117 (2023). https://doi.org/10.1007/s10903-023-01490-5
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DOI: https://doi.org/10.1007/s10903-023-01490-5