- Research article
- Open Access
- Open Peer Review
Impact of the UN convention on the rights of persons with disabilities (UN-CRPD) on mental health care research - a systematic review
BMC Psychiatryvolume 16, Article number: 166 (2016)
The United Nations Convention on the Rights of Persons with Disabilities (UN-CRPD) aims at stimulating profound changes and social development in many areas of the society. We wanted to examine the impact of the convention on mental health care research up to now by a systematic review.
We searched relevant electronic databases for empirical studies from the area of mental health which focused directly on the content of the UN-CRPD.
One thousand six hundred ten articles were screened, 36 of which fulfilled the inclusion criteria and came from 22 different countries. 25 studies (69 %) are related to persons with intellectual disabilities, only 11 to other mental disorders. Study designs were quantitative and qualitative as well. Issues were realisation of the UN-CRPD, implementation and financing, development of instruments, and attitudes towards the UN-CRPD.
In contrast to possible wide-reaching consequences for the organisation of mental health care, theoretical debates prevail as of yet and empirical research is still scarce. Research on the UN-CRPD is more advanced for intellectual disabilities and provides good suggestions for relevant research aspects in major mental disorders.
The United Nations (UN) Convention on the Rights of Persons with Disabilities (UN-CRPD)  was adopted by the United Nations General Assembly in 2006 and came into force in 2008. It was ratified by the European Union in 2010 and, in total, by 156 states in 2015. The UN-CRPD is the most recent in a row of UN human rights declarations, beginning from the Universal Declaration of Human Rights in 1948 . The ratifying states acknowledge that the principles of the UN-CRPD should be transposed into their national legislations. Guiding principles are respect for inherent dignity, individual autonomy including the freedom to make one’s own choices, non-discrimination, full and effective participation and inclusion in society, equality of opportunity, and accessibility. The general idea of the UN-CRPD is inclusion of disabled people into the society and communities instead of establishing special rules and institutions . Phrasing general principles of human rights, the UN-CRPD is completely applicable to the situation of people with mental illnesses as well as with other kinds of disabilities. Mental illness is not necessarily associated with disability; however, a clear distinction is not required since the UN-CRPD phrases principles which should be valid for all human beings, disabled or not. In the past two years, most interest has been attracted by article 12 (equal recognition before the law). This article does not contain any restrictions due to reduced mental capacity, which led to the idea that such a construct is generally not valid. Consequently in 2013, the special rapporteur on torture and other cruel, inhuman or degrading treatment or punishment of the UN Human Rights Council claimed to abolish all kind of coercive treatment as well as substituted decision-making legislations such as guardianship . This has caused considerable concern among psychiatric organisations and stimulated ongoing controversies between psychiatrists and patients’ organisations in some countries . However, this current and mostly critical discussion thwarts the engagement with the other aspects of the UN-CRPD – setting goals for mental health care that are not less challenging. The UN-CRPD aims at stimulating profound changes and social development in many areas of the society such as schools, workplace environment and public transportation. On this behalf, the convention calls for data gathering and research in the signatory states. Taking into account this and the huge political relevance of the UN-CRPD, we wanted to examine the impact of the convention on mental health research up to now by a systematic review.
Our systematic review aims to identify studies that can be seen as a direct product of the impact of the UN-CRPD on mental health care research. For this purpose, a sequence of selection processes have been performed as described below.
The applied methods are in line with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines .
Potentially relevant studies were identified by searching the electronic databases All EBM Reviews, Embase, Ovid MEDLINE(R), Ovid MEDLINE(R) In-Process & Other Non-Indexed Citations, PsycINFO and PSYNDEX plus Literature and Audiovisual Media. The searching process was performed in Ovid and conducted between the 3rd of July and the 17th of July 2015. We used the broadest possible search string consisting only of the nouns in the title of the UN-CRPD. Thus, we used the following search term in the multi-field search in Ovid: “convention” AND “rights” AND “persons” AND “disabilities”. Taking into account the possible national or regional character of research in this field, no language restrictions were made. This yielded 1610 articles.
Studies were selected in a two-stage process based on predefined inclusion and exclusion criteria.
In the first step, three criteria were applied. The first inclusion criterion was the requirement that a study was published in the context of the UN-CRPD. Consequently, we excluded articles which did not contain the term UN-CRPD (abbreviated or written-out) in its title, abstract or keywords.
The second inclusion criterion was the condition that the article could be classified as focused on the area of “mental health”. For the purpose of our study we defined mental health as mentioning of the terms “mental health“, “mental illness”, “mental disorder” or explicit mentioning of a diagnosis out of the International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10), chapter F (mental and behavioural disorders). Terms related to intellectual disability (ID, ICD-10 F 7x) such as “intellectual disability” and “mental retardation” also justified inclusion.
The third inclusion criterion required that a study could be classified as empirical. We defined empirical studies as all studies which are the product of research based on experimentation or observation. Thus, all studies were excluded which did not apply any form of qualitative or quantitative research. We assigned those excluded studies to three categories termed ‘legal discussion’ , ‘theoretical framework’ and ‘reviews or overviews’. The category ‘legal discussion’ refers to all studies which can be assigned to the juridical realm and which are based on norm-driven assumptions. ‘Theoretical framework’ delineates those articles which are based on theoretical concepts and their discussion. This category also includes case study-approaches without generalisations about a larger population. Finally, the category ‘reviews or overviews’ captures all non-systematic literature reviews, historical overviews, book reviews and general overviews about specific subject areas. All those excluded studies have in common that they did not produce or analyse real-world data.
We applied no a priori language restrictions to our search since we were confident to find competent translators in our multi-national hospital and research staff for all common languages. The Consort diagram of the selection process is displayed in Fig. 1. Deliberately, the first evaluation was rather lenient to avoid type II errors (false negative) at the expense of type I errors (false positive). The assessment of studies in the first-stage process was based on titles and abstracts.
In the second-stage process we identified those of the studies kept after the first-stage process that focused directly on the content of the UN-CRPD. Three authors (CS, SJ, EF) evaluated their full text content independently. An article was qualified as focusing on the UN-CRPD based on its research question or aim. To be included, the research question or aim must have targeted directly on the UN-CPRD. This condition was fulfilled when the research question either explicitly addressed the UN-CRPD or when it dealt with one of its general principles codified in Article 3. For the latter case, the concepts of inclusion and participation were central keywords.
Ambiguous cases were only included after discussions between the researchers. This final screening phase resulted in studies which were judged as directly inspired by the UN-CRPD. Those studies can be seen as direct product of the convention and their research was carried out in the light of the UN-CRPD.
In the first-stage process, we identified 1,610 studies. 327 studies were excluded because they did not cover the UN-CRPD, 824 studies were excluded because they did not cover mental health, and 381 studies were excluded because they were non-empirical. So after the first screening process 78 studies remained. After 4 duplicates had been removed, 74 articles were assessed on basis of the full-text content. In this second-stage process, 38 studies turned out to be not directly focussing on the content of the UN-CRPD. Eventually 36 articles could be included.
Those 36 relevant studies were categorized into two groups. The first group incorporates all publications in the area of intellectual disabilities (ICD-10 F 7x) which are displayed in Table 1. In total, there are 25 publications in the realm of intellectual disabilities representing 69 % of all included studies. The second group contains all publications on other mental disorders which are displayed in Table 2. There are 11 publications on mental disorders representing 31 % of the included studies. The included studies were carried out in 22 countries illustrating the global dimension of the UN-CRPD. The country with the highest number of studies is Australia (8, 22 %). The included studies employed multi-method approaches ranging from randomised controlled trials (RCTs) to different quantitative and qualitative approaches. In total, there are 2 RCTs (6 %), 17 quantitative studies (47 %) and 17 qualitative articles (47 %).
Table 3 depicts a typology of all included studies from Tables 1 and 2. To categorise the multitude of diverse studies, we identified four major themes of research in light of the UN-CRPD. The first major theme is the realisation of the UN-CRPD and comprises all studies which investigate the gap between the aspirations of the convention and reality. While realisation consequently describes the practical fulfilment of the UN-CRPD, the second major theme termed ‘implementation and financing’ describes the legal fulfilment of the UN-CRPD. Studies belonging to this major theme analyse the implementation of the UN-CRPD in national legislation and as one specific aspect the financial framework as an indispensable condition for an effective implementation. The third major theme of studies inspired by the UN-CRPD is the development of instruments to capture the realisation of the convention. While the aim of those instruments is eventually to quantify the realisation of the UN-CRPD, articles belonging to this category focus rather on the construction of instruments than on the realisation as such. The last major theme we identified were attitudes towards the fulfilment of rights which are enshrined in the convention and the general awareness of the population of those rights. Studies belonging to this group analyse the realisation of the convention in people’s minds as an essential precondition for a realisation in practical terms. Taken together, there are 27 studies (75 %) focusing on the realisation of the UN-CRPD, 3 studies (8 %) investigating the implementation and financing, 3 articles (8 %) concerned with the development of instruments and 3 studies (8 %) analysing attitudes towards the UN-CRPD. Table 3 shows that 16 studies (44 %) apply a broad perspective focusing on the UN-CRPD as a whole, while 20 studies (56 %) investigate individual articles of the convention.
The most important result of this review was what it did not find: an appropriate amount of research in mental health care reflecting the importance of the UN-CRPD. Empirical research on aspects of the UN-CRPD is still scarce. This is in sharp contrast with the huge impact it could and probably will have on the complete organisation and structure of mental health care in all ratifying countries. 25 out of 36 studies that could be included (69 %) were related to intellectual disabilities, which was an unexpected result. Intellectual disabilities fall into the definition of mental disorders as classified in the ICD-10, chapter F (F 7) and thus fulfilled our inclusion criteria, but in most countries service provision and care is separate from other mental disorders. In published articles, the term ‘mental disorder’ typically refers to psychotic and affective disorders, though intellectual disabilities and dementia are also classified as mental disorders. None of the included articles referred to dementia or acquired brain injury. Anyway, the detected body of research on intellectual disabilities provides valuable insight on important research topics which should be put on the agenda for other severe mental disorders.
The majority of studies inspired by the convention analyses to what extent the aspirations of the convention are realised in a real-world context. Drew et al.  find a wide range of violations of the convention’s aims in low-income and middle-income countries. Kogstad  demonstrates that there is also a gap between human rights aims and patients’ experiences in a high-income country. To bridge the gap between aspirations and reality, Vijayalakshmi et al.  assign the right to education a catalyst function. Successful examples of realisation of the UN-CRPD are represented by the studies by O’Brien et al.  and O’Connor et al.  who show the positive effects of inclusion in postsecondary education. In the same vein, Sermier Dessemontet and Bless  demonstrate that there is no negative impact of inclusion on the achievements of non-disabled peers. Furthermore, the studies of Frawley and Bigby  and McConkey et al.  represent best-practice examples for the fulfilment of the principles of the convention. Other studies focus on the realisation of individual aspects of the convention such as access to physical care , participation in leisure activities [16, 17] or the choice of living arrangements [18, 19]. While those studies offer valuable insights, there is still a lack of systematic studies investigating the realisation of the UN-CRPD as a whole.
Moreover, there is a paucity of research about the implementation of the convention into national legislation. Battams and Henderson  provide such a study for the context of Australia and Kleintjes et al.  analyse the specific aspect of mental health care user participation in policy development and implementation. While there is a multitude of articles in the judicial realm analysing and discussing the implementation of the UN-CRPD, there is a lack of empirical studies concerned with this question. Also studies investigating attitudes towards the rights in the UN-CRPD and capturing the awareness of those rights are still rare. McConkey and Leavey  provide such a study specifically for Irish attitudes towards the right to sexual fulfilment of persons with intellectual disability. Angermeyer et al.  have a broader scope investigating general changes in public attitudes towards restrictions on mentally ill people. Gobrial’s  study analyses the public awareness of children’s rights with intellectual disability in Egypt. While those studies are interesting on their own, they just offer insights on specific attitudes about particular rights. There is lack of studies capturing the general awareness of the convention and general attitudes towards its meaning in the population. Finally, there are some remarkable attempts to develop instruments to capture the realisation of the UN-CRPD. While Nomidou’s  study is based on the World Health Organization (WHO) QualityRights toolkit, Aznar et al.  have developed a particular instrument called ISRPID to capture the realisation of the rights of persons with intellectual disabilities. Similarly, Randall et al.  have developed the Institutional Treatment, Human Rights and Care Assessment (ITHACA) toolkit which allows a systematic monitoring of the rights enshrined in the UN-CRPD. Those instruments have a huge potential to serve as a base for further studies investigating the realisation of the convention’s rights.
Our review has several limitations. First of all, we may have applied too narrow inclusion criteria that limited the scope of possibly relevant studies. For instance, no example of peer research, i.e. participatory research by mental health service users, could be included. The few research papers we could find had a focus slightly different from issues in the UN-CRPD, e.g. they focused on everyday experiences and individual coping strategies [28, 29]. Although they are covering important topics that are related to rights of people with disabilities the research was not explicitly ‘a direct product of the UN-CRPD’ as was required in this review paper. This is indeed a shortcoming of our inclusion criteria. Similarly, we could not include some methodological articles on the improvement of methods for the research in people with particular disabilities (e.g. specific interview techniques, participatory research) although they addressed a necessary precondition of the research we were interested in . Further, the reliability of the criteria could be questioned. To rate studies as empirical studies in the area of mental health and in the context of the UN-CRPD seems quite straightforward. But whether a study focused directly on the content of the UN-CRPD is to some degree vague. It is possible that other researchers would have come to a somewhat different set of included studies.
There is urgent need for further research in all areas covered by the UN-CRPD relating to mental disorders. Much more evidence is needed for answering the many questions that are posed by the UN-CRPD, such as how inclusion and equality can be realised for people disabled by mental disorders and what impact a change of policies, service provision, legislation, and attitudes would have on their mental health. Up to now, the different research projects have been rather isolated and often focused on specific subject areas. While the UN-CRPD has inspired several studies, those studies are rather disconnected projects than part of a coherent body of research. More research has been done in the field of intellectual disabilities as compared to the field of severe mental disorders. This offers interesting suggestions to learn from. We therefore recommend systematic and ideally transnational research projects investigating the realisation and implementation of the UN-CRPD. In particular, in the subfield of mental disorders there is still a paucity of research about the achievements of the UN-CRPD. Further research in this area would contribute to pave the way for an effective realisation of the basic principles enshrined in the UN-CRPD.
International Statistical Classification of Diseases and Related Health Problems, 10th revision
intellectual and developmental disabilities
ITINERIS scale on the rights of persons with intellectual disabilities
Institutional Treatment, Human Rights and Care Assessment
Preferred Reporting Items for Systematic Reviews and Meta-Analyses
randomised controlled trial
United Nations Convention on the Rights of Persons with Disabilities
United States of America
World Health Organization
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The authors declare that there was no funding.
Availability of data and materials
All data supporting our findings is contained within the manuscript.
CS carried out the database search, participated in the evaluation of the identified records and drafted the manuscript. TS conceived of the study, participated in the evaluation of the identified records and helped to draft the manuscript. SJ participated in the evaluation of the identified records and helped to draft the manuscript. EF participated in the evaluation of the identified records, helped to draft the manuscript and drafted the flow diagram. All authors read and approved the manuscript.
The authors declare that they have no competing interests.
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