Impact of racism and discrimination on physical and mental health among Aboriginal and Torres Strait islander peoples living in Australia: a systematic scoping review
BMC Public Health volume 21, Article number: 1302 (2021)
Racism is increasingly recognised as a significant health determinant that contributes to health inequalities. In Australia efforts have been made to bridge the recognised health gap between Aboriginal and Torres Strait Islander people and other Australians. This systematic scoping review aimed to assess, synthesise, and analyse the evidence in Australia about the impacts of racism on the mental and physical health of Aboriginal and Torrens Strait Islander peoples.
A systematic search was conducted to locate Australian studies in English published between 2000 and 2020. Five electronic databases were used: PubMed, CINAHL, Embase, Web of Science and the Australia’s National Institute for Aboriginal and Torres Strait Islander Health Research. The search strategy included a combination of key words related with racism, mental health, physical health and Indigenous people. Data were extracted based on review questions and findings were synthesized in a narrative summary.
Of total 338 searched studies from five databases, 12 studies met the inclusion criteria for narrative synthesis where eight were cross-sectional studies and four prospective cohorts. General mental health and general health perception were the most frequently studied outcomes followed by child behaviour, smoking and substance consumption and specific health conditions. The prevalence of racism varied between 6.9 and 97%. The most common health outcomes associated with racism were general poor mental health and poor general health perception. More specific health outcomes such as anxiety, depression, child behaviour, asthma, increased BMI and smoking were also associated with racism but were analysed by a limited number of studies. Three studies analysed psychological distress, negative mental health, sleeping difficulties and negative perceived mental health according to severity of exposition to racism.
Racism is associated with negative overall mental and negative general health outcomes among Aboriginal and Torres Strait Islander peoples. Strategies to prevent all forms and sources of racism are necessary to move forward to bridging the health gap between Aboriginal and Torres Strait Islander peoples and non-Indigenous Australians. Further research is needed to understand in more detail the impact of racism from an Aboriginal and Torres Strait Islander definition of health and wellbeing.
Racism has been defined as the manifestation of racist beliefs, emotions, behaviours, and practices that perpetuate and aggravate disparity of opportunity of an ethnoracial group . Racism has been described to occur at three main levels . These levels include a) interpersonal racism, which refers to the discriminatory behaviour from one individual towards another, b) systemic or institutional racism, expressed by institutions through policies or practices that reduce benefits and opportunities among the oppressed group , and c) internalized racism defined as the adoption by the stigmatized people of negative beliefs about their capacity and value . Globally, research is demonstrating with increasingly solid evidence that racism and discrimination have detrimental impacts on health and is a significant factor contributing to health disparities in different countries [5, 6]. Although the exact pathophysiological process involved in racism affecting health is not completely understood, it has been demonstrated that racism causes alteration in some physiological activities that lead to permanent changes associated with disease . It can also reduce access to other important determinants of health such as employment, housing, and education  and can lead to unhealthy behaviours such as smoking and alcohol consumption . Global efforts against any kind of discrimination have been made and are reflected through conventions and declarations such as the international convention on the elimination of all forms of discrimination , the Universal Declaration of Human Rights  and, the United Nations Declaration on the Rights of Indigenous Peoples . Despite this, racism towards indigenous peoples continues to be consistently reported worldwide [13,14,15,16].
Australia is inhabited by two different groups of Indigenous peoples: Aboriginal and Torres Strait Islanders. Each has its own distinctive and established values, cultural protocols, and unique living manner . The term “Indigenous” is often used to describe both Aboriginal and Torres Strait Islander peoples. However, many Aboriginal and Torres Strait Islander people dislike being referred to as “Indigenous” as the term homogenises two different cultural groups into one word that has also been used to describe flora and fauna . Within this manuscript, we capitalise the term Indigenous according to terminology preferences when referring to Aboriginal and/or Torres Strait Islander peoples set by the Council of Social Services . The word “Indigenous” refers to Indigenous Australians whilst the word “indigenous” is used to describe all indigenous peoples of the world. Discrimination and racism against Aboriginal and Torres Strait Islander people in Australia is a current reality aggravated by shared experiences of dispossession and intergenerational trauma from ongoing colonial practices [20, 21]. The 2014–2015 National Aboriginal and Torres Strait Islander Social Survey, evidenced that one-third of Aboriginal and Torres Strait Islander people aged 15 or older had felt treated unfairly in the previous year because of being Aboriginal and/or Torres Strait Islander . According to the Reconciliation Barometer survey, 43% of Aboriginal and Torres Strait Islander respondents experienced racial prejudice in the last 6 months compared to 20% of the rest of the community . A recent study available in the Journal of Australian Indigenous Issues revealed that three in four people unconsciously hold a negative prejudice against Aboriginal and Torres Strait Islander peoples .
In Australia, the “Indigenous health” panorama is well known for the existence of what is called by the government and public health sector as “The gap.” It refers to the wide health disadvantage that Aboriginal and Torres Strait Islander peoples have in comparison to the rest of Australians. The Australian Institute of Health and Welfare estimated that Aboriginal and Torres Strait Islander people born between 2015and 2017 had 8.6 and 7.8 fewer years of life expectancy than other male and female Australians, respectively . In the year 2011, Aboriginal and Torres Strait Islander people experienced 2.3 times the total disease burden (disability-adjusted life years or DALYs) of other Australians , they also have nearly three times the risk of being physiologically distressed and two times the risk to die by suicide than other Australians . A statement of intent called the “Close the Gap initiative” was signed in 2008 by the prime minister of the time to narrow the health disparity experienced by Aboriginal and Torres Strait Islander peoples by the year 2030 . However, 10 years after the initiative started, follow-up showed negligible progress, and the program is very far from achieving its goals . In 2020, the Closing the Gap targets were refreshed after many years of advocacy from Aboriginal and Torres Strait Islander communities and organisations to widen the focus. The Closing the Gap refresh now includes four “priority reform areas” and 16 new targets; however, it has been met with a critique on the ability for communities to enact true self-determination and lacks focus on structural reform needed to address racial disparities [30, 31].
Nationally and internationally, academics have argued that failure of efforts to bridge health inequalities has been due to interventions focusing primarily on behaviour change at individual and interpersonal levels despite the solid evidence recognising the relationship of structural determinants of health such as racism and health disparities [32,33,34]. The “2030 Agenda for Sustainable Development” by the United Nations and the Australian Medical Association have recognized the need to address indigenous health inequalities and have made a call to increase indigenous peoples participation and reduce institutional and interpersonal racism [35, 36]. Studies have already showed that initiatives addressing racism have indeed the potential to improve health . However, solid evidence of the unique characteristics of Aboriginal and Torres Strait Islander peoples is needed to move forward to create and implement more effective interventions in Australia . Consequently, this scoping review aims to localize and analyse evidence in regard to the magnitude of racism and its association with multiple physical and mental health outcomes among Aboriginal and Torres Strait Islander peoples. It aims to provide a precise description of racial discrimination and its impact on the physical and mental health of Aboriginal and Torres Strait Islander peoples. The results will serve as foundation for researchers, policymakers and, change-makers to design and implement culturally tailored public health interventions to tackle this issue and hence, improve the persistent health inequalities between Aboriginal and Torres Strait Islander peoples and other Australians.
The protocol for this scoping review was previously completed and published . The reporting guidelines and criteria set in Preferred Reporting Items for systematic review (PRISMA)  were also followed and a PRISMA extension for Scoping Reviews (PRISMA-SCR) checklist was filled (Additional file 1).
This review followed the stages proposed on the methodological framework for scoping reviews by Arksey and O’Malley  and later revised by Levac . The reviewe involved six phases explained below:-.
Stage 1. Identifying the research question
The aim of this study is to understand and analyse the impacts of racism on the health of Aboriginal and Torres Strait Islander people living in Australia.
Stage 2. Identifying relevant studies
A systematic search was conducted between between the 01st of January of 2000 and June 2020 using the following databases: the Australia’s National Institute for Aboriginal and Torres Strait Islander Health Research, CINAHL, PubMed, Embase and Web of Science. This timeframe was decided based on findings evidencing that no primary studies are lost when performing searches that include studies from the last 20 years . We Used a combination of different keywords related to “Aboriginal and Torres Strait Islander peoples”, “Racism”, “Discrimination” and “health”, using “OR” and “AND”. The complete list of key words is shown in Table 1. Additionally, citation tracking was performed using the reference lists of all selected studies and a manual search was conducted using Google and institutions websites relevant to the topic.
Stage 3: study selection
All the search results were exported to the citation manager EndNote X9  and duplicates were removed. Then, tittles and abstracts were screened independently by two reviewers to select relevant papers. Full- text articles meting inclusion criteria were assessed independently by two reviewers. Discrepancies between reviewers was resolved by discussion to reach consensus.
Studies in English conducted among Aboriginal and Torres Strait Islander peoples of all ages and gender regardless of any socio-demographic characteristics.
Perceived experience of racism defined as the feeling of receiving an unequal valuation or unfair treatment for being an Aboriginal or Torres Strait Islander person. The experience of racism could be self-reported or reported by a child’s carer or a witness such as family or friends. Papers analysing health outcomes with racism exposure at any point in time before the study were included.
Outcomes measuring physical and mental health spheres along with other health-related outcomes. Physical health outcomes included chronic conditions such as, cardiovascular disease, chronic obstructive pulmonary disease (COPD) and asthma, hypertension, diabtes, cancer and abnormal body mass index. It also included health risk behaviours (smoking, alcohol consumption and other substance use). Mental health outcomes including psychological factors like depression and anxiety, psychological distress, social and emotional wellbeing, illness representations (satisfaction with life, quality of life, self-efficacy, satisfaction with illness) and suicide.
Only studies using quantitative methods (control-case studies, cross-sectional, and cohort studies) were included.
Articles studying autoimmune disorders, and cystic fibrosis. (This decision was based on i) The multifactorial cause of such conditions and their strong polygenetic component [45,46,47] which we consider is an important limitation to draw conclusions about a causal association and ii) The lack of studies assessing the association between racism and autoimmune disorders found during our pilot search in the Australian context.)
Experimental studies (randomized controlled trials (RCTs) and controlled clinical trials (CCTs)).
Studies published in language different to English, studies found only as abstract, letters to the editor, commentaries, editorials and reviews.
Stage 4. Charting the data
Primary investigator extracted the data into an excel spreadsheet. The following information was extracted when available: author, year of publication, journal, type of study (study design), location of the study (state or city), sample size, sample source, sample demographic characteristics, exposure measure including tools or instruments, exposure timeframe and severity, studied outcomes, strength and direction of the associations between racism and health outcomes along with the type of data used to quantify the association (odds ratio, hazard ratio, correlation coefficients). UNY randomly selected 10% of the articles meeting eligibility criteria to double check all the data listed before. Data was compared, and any discrepancies were resolved by consensus.
Stage 5. Collating, summarizing and reporting the results
The data of the studies included was analysed and summarized following a descriptive synthesis process based on the recommendations of the Joanna Briggs Institute Reviewer’s Manual . Quality appraisal of the studies included in the review was performed using the Joanna Briggs Institute critical appraisal tools, according to each study design [49, 50].
Stage 6. Consulting with key stakeholders
Two members of this review team (authors KBB and JC) who represent Aboriginal and Torres Strait Islander people living in Australia reviewed and validated the interpretations of the data.
After searching on the five databases, 335 articles were found and three more were located by manual search. From these, 120 duplicates were removed, and 218 papers were initially screened. Of 218 titles and abstracts, 20 studies were eligible for inclusion in this review. After full-text assessment 8 more articles didn’t meet inclusion criteria and were excluded as indicated in the PRISMA flow diagram (Fig. 1).
Of 12 studies included, five (5/12, 41.%) were conducted across different locations within Australia [51,52,53,54,55], Three (3/12, 25%) were conducted in the Northern Territory [56,57,58], three (3/12, 25%) in Victoria [34, 59, 60], and one (8.%) in an isolated rural town with a non-specified location . Fifty percent (6/12) of the studies included were published after the year 2015 [34, 51,52,53,54,55], another 42 % (5/12) between 2010 and 2015 [56,57,58,59,60], and 8 % (1/12) were published before 2010 . Most studies (8/12, 66.%) were Cross-sectional studies [3, 34, 53, 56,57,58,59,60], whilst four (4/12, 33%) were prospective cohorts [51, 52, 54, 55]. Seven studies were conducted among teens over 12 years and adults [3, 34, 56,57,58,59,60]; four focused on children younger than 12 years [51, 52, 54, 55], and one on elderly people . The total sample size across the 12 articles consisted of 44,517. The article with the smallest sample included 164 participants , whilst the larger sample included 2606 participants . It is important to mention that more than one article used the same study for sampling in some cases. Four articles extracted their sample from the Longitudinal Study of Indigenous Children (LSIC) [51, 52, 54, 55], and two articles used the Diabetes and Related conditions in Urban Indigenous people in the Darwin region (DRUID) study [56, 57]. The sample source of each article and the characteristics of the studies are described in Table 2.
Exposure to racism
All articles studied the effect of direct racism except one study that also studied the indirect effect of racism on the child where racism was experienced by the parent or carer . Eight of the included papers studied interpersonal racism [3, 51, 52, 54,55,56,57, 59], one study included both interpersonal and institutional racism  and three had broad measures of racial discrimination, without considering specific types of racism [34, 58, 60]. The majority of the included papers (10/12, 83.%) studied exposure to racism through questions about having experienced bullying, discrimination, or unfair treatment because of being Aboriginal or Torres Strait Islander [3, 34, 51,52,53,54,55, 58,59,60];whilst two [56, 57] used the Measure of Indigenous Racism Experiences (MIRE) . In most of the articles, the instrument used (8/12, 66.%) didn’t specify the exposure- timeframe [51, 52, 54,55,56,57,58, 60], whilst a 12- months exposure timeframe was used by three (25%) [34, 53, 59] and only one  used a 4-week timeframe. The instruments used to study the exposure to racism along with the time and severity of the exposition are summarized in Table 3. The prevalence of at least one self-reported experience of racism or racism reported by the parents or carer was variable with one study reporting a prevalence of 97% . The prevalence of racism reported by each study and across the different States and Territories and age groups is shown in Table 4 and Table 5. According to the studies included, the state with the highest prevalence of racism was Victoria with reports of prevalence ranging from 52 to 97%. Moreover, first exposure to racism was reported to occur as early in life as 4–5 years of age  and according to the studies, people between 12 and 45 reported racism most frequently.
Fifty percent (6/12) of the articles studied mental and physical health outcomes [3, 54, 55, 57, 58, 60], 33 % studied mental and behavioural outcomes [52, 53, 56, 59], whilst one article examined self-reported general health  and another studied mental, physical, behavioural outcomes and smoking or alcohol consumption together .
Mental health and behavioural outcomes
Among the mental health component, negative general mental health was the most reported outcome (10/12, 83.%) [3, 51,52,53,54,55, 57,58,59,60] followed by depression (3/12, 25%) [56, 58, 60], sleeping difficulties (3/12, 25%) [51, 54, 55], bad behaviours (measured in two studies [51, 55] by carer’s report of having been contacted by the school because the child had bad behaviour and in one  using the items of conduct problems, hyperactivity and peer problems from the strengths and difficulties questionnaire) (3/12, 25%) [51, 52, 55], and anxiety (2/12, 16.%) [52, 58]. Smoking and alcohol consumption was examined by one study  as well as suicide .
Physical health outcomes
Regarding the physical health component, its association with experiences of racism was mainly studied through the assessment of general health perception (7/12, 58%) [3, 34, 51, 54, 55, 57, 60]. Four articles (33.%) studied the association with Body Mass Index (BMI) [51, 54, 55, 58], one examined Waist-to-hip ratio  and one asthma .
Mental health and behavioural outcomes
Racism was associated with a negative overall mental health component in 100% of the studies that reported the outcome (10/10) [3, 51,52,53,54,55, 57,58,59,60]. Two studies of three repoted association of depression with racism [56, 58] (66%). Studies that assessed bad behaviours [51, 52, 55] and sleeping difficulties [51, 54, 55] showed its association with racism (3/3, 100%), whilst only half of the studies showed association of anxiety with racism(1/2, 50%) . One study that examined behaviours such as alcohol and cigarette consumption among children aged 4–12 years, found association of racism with having tried cigarettes but not with alcohol consumption .
Physical health outcomes
Almost 43% of the papers studying general health perception found that a negative health perception is associated with racism (3/7, 42%) [3, 34, 60]. One out of four studies  examining BMI found that racism is associated with obesity (1/4, 25%). The study that analysed specific conditions found association between asthma and reported racism .
Association between level of exposure to racism and outcomes
Three articles studied the association between racism and health outcomes according to the severity of the exposure [34, 53, 54]. Temple et al., (2020) found the participants who reported experiencing racism always had a higher risk of presenting psychological distress compared to the ones reporting racism sometimes . A study by Shepherd et al., (2017) found that children were more likely to present negative mental health outcomes and sleep difficulties when the carer reported persistent racism exposure compared to one-time exposure . The results of the study conducted by Markwick et al., (2019) showed that the likelihood of reporting negative perceived health was three times higher when experiencing racism monthly and 1.5 more likely when experiencing racism yearly .
The quality of the 12 studies included was assessed using The Joanna Briggs Institute critical appraisal tools for cohort and cross-sectional studies [49, 50]. This tool has been considered a valid approach to assessing the methodological quality of studies in systematic reviews [62, 63]. Two reviewers appraised the articles independently (authors CK and UNY) and discrepancies were resolved by discussion to reach consensus. Six studies were classified as high quality, whilst the other six met criteria for moderate quality. The results of the assessment are found in Table 6.
Aboriginal and Torres Strait Islander peoples have survived and thrived over millennia and are the world’s longest continuing living civilization. Since colonisation, however, disempowerment and ongoing manifestations of racism have undermined Aboriginal and Torres Strait Islander peoples [8, 22,23,24, 32, 58, 64, 65]. Addressing racism as a determinant of ill health has been identified as a national priority [28, 58] and a paramount component to effectively closing the health gap between Aboriginal and Torres Strait Islander and other Australians that previous efforts have failed to do during the last 10 years [32,33,34,35,36]. Accordingly, this study intended to collect and synthesize available evidence on the impacts of racism on Aboriginal and Torres Strait Islander people’s mental and physical health, which adds to the evidence base for First Nations communities within Australia. Our findings may guide the design and implementation of strategies to reduce racism and therefore contribute to improving Aboriginal and Torres Strait Islander people’s health. With our results, efforts can be directed towards better understanding health racial inequities in particular mental health and cardiovascular conditions, which have previously demonstrated clear racial disparities in prevalence and progession [66, 67]. If racial discrimination is perceived by the larger society as a health risk factor similar to smoking, obesity or substance abuse, this may promote greater interest in reducing behaviours that unintentionally disadvantage Aboriginal and Torres Strait Islander people.
For Aboriginal and Torres Strait Islander people, health is holistic and understood from a whole of life view that goes beyond the physical to encompass social, emotional, and cultural wellbeing of not just an individual but also the whole community [68, 69]. Differentiated from mental health, the term “social and emotional wellbeing” is more culturally appropriate and recognises that connection to culture, land, spirituality, family, and community. These are important to Aboriginal and Torres Strait Islander peoples and can impact one’s wellbeing . It includes social justice, equity, rights, traditional healing, traditional knowledge, and connection to a country .
Current scoping review results are in line with international evidence demonstrating the association of racism with poorer physical and mental health outcomes. In this review, the studies reported the association across different age groups indicating that racism produces detrimental health effects on physical and mental health outcomes of Aboriginal and Torres Strait Islander people at any stage of life. Racism had greater negative effects on the mental health component, especially with negative general mental health which was the most studied outcome [3, 51,52,53,54,55, 57,58,59,60]. Association with depression, behaviour problems in children and sleeping difficulties were also consistently reported although only three articles included in this review studied those outcomes which is a limitation. However, multiple studies performed in different countries including the biggest systematic review on the topic, supports the association linking racism with depression, post-traumatic stress and suicidal ideation on ethnic minorities [8, 71,72,73]. Although further studies could provide a better picture of the association of racism with those and unmask other conditions, our study suggest that tackling racism is necessary to achieve better mental health outcomes among Aboriginal and Torres Strait Islander peoples.
Three out of seven articles (42.%) that studied general health perception found a statistically significant negative association with racism [3, 34, 60]. Only one study found an association with obesity , and asthma  in children, whilst none of the included articles measured conditions such as blood pressure, diabetes, COPD or cardiovascular disease. The association of racism with these conditions should be interpreted with caution since the limited or inexistent number of articles studying these outcomes may lead to an underestimation. Although the findings show that racism can lead to the detrimental health impact. The scarcity of articles studying more specific health outcomes and an Indigenous paradigm of health and wellbeing indicates that further research is needed to demonstrate that racism is inextricably linked with adverse health outcomes and health inequities among Aboriginal and Torres Strait Islander peoples. A starting point for this is the study by Priest et al., (2020), which found that Australian children from different ethnic minorities, including 18 Aboriginal and/or Torres Strait Islander children, who experienced racism on two or more occasions had increased BMI z-scores, systolic blood pressure, waist circumference and saliva inflammatory markers . Supporting our findings, international studies have demonstrated the association between racism and hypertension among ethnic minorities [75, 76]. More research is needed with strong methodological designs grounded in Indigenous methodologies and taking a human rights-based approach that demonstrates the association of racism with different chronic health conditions and its negative impacts on Aboriginal and Torres Strait Islander peoples’ health across the life course. This would contribute to placing racism on the public health agenda and provide an alternative to the current approach to policymaking that often reinforces racism resulting in health inequities .
In the present review, one study reported the association of racism with smoking and alcohol consumption . Studies conducted with Aboriginal and Torres Strait Islander peers in New Zealand, indicate that experiences of racism have been linked with smoking behaviour from early adolescence, hazardous alcohol consumption, binge drinking, and substance abuse [78,79,80,81]. A study among African-American youth found that substance abuse was a racism coping strategy , however, within an Australian context, this association with racism would need to be considered as an ongoing manifestation of colonisation [83, 84]. These results suggest that reducing racism could positively impact health by reducing hazardous substance use among Aboriginal and Torres Strait Islander peoples.
There is an urgent need to address institutional racism as a strategy in Australia in order to improve the health and wellbeing of Aboriginal and Torres Strait Islanders [85, 86]. Whilst in the present review, most of the studies focused on the health impacts of interpersonal racism; Temple et al. (2020) observed that over 50% of older Aboriginal and Torres Strait Islander people who experienced unfair treatment in health care facilities (52%), service settings (50%) and education (55%) were psychologically distressed . Moreover, although most of the papers studied experiences of direct racism, one study  found significant negative health outcomes on children whose carers had experienced racism. Similar findings have been found in other countries [87,88,89]. This adds evidence on the different mechanisms by which racism can cause poor health and highlights the need for strategies to address all different forms and sources of racism if the health gap wants to be bridge.
The prevalence of racism varied from study to study and was as high as 97%. Aboriginal and Torres Strait Islander people aged 12–45 years represent the group with the highest racism experience. A high prevalence of racism against indigenous people has also been reported in other developed countries [90, 91]. Looking at the situation from the other side of the coin, helps to explain the data. In Australia, a study including non-Indigenous Australians aged 25–44 evidenced that 1 in 5 people admit they would discriminate against Aboriginal and Torres Strait Islander peoples in some situations, 30–40% have negative stereotypes of Aboriginal and Torres Strait Islander peoples and 24–30% understand acts of discrimination against Aboriginal and Torres Strait Islander peoples as an automatic response . This illustrates that effective interventions to reduce the health gap must not be directed towards changing Aboriginal and Torres Strait Islander peoples’ behaviors but needs to include a change in beliefs and behaviours of all Australians.
There were five studies conducted across all of Australia [3, 51,52,53,54,55]; however, the study settings were not clearly mentioned. There were no studies that focused specifically on Queensland, South Australia, Western Australia or Tasmania, and none in New South Wales where the highest population of Aboriginal people live . Further studies are needed with Aboriginal and Torres Strait Islander communities living within these geographic areas.
No studies were found comparing differences of the health impact of racism between Aboriginal people and Torres Strait Islander people. Comparative research could provide more understanding of possible variations in factors such as the most prevalent type of racism by location or differences in the impact of racism on health outcomes in different Aboriginal and Torres Strait Islander communities.
The quality of the included studies was assessed by two authors (CK and UNY) using the Joanna Briggs Institute tool [49, 50] and was found to be moderate to high quality. One of the main strengths of the included articles was their robust sample sizes. Although most had a cross-sectional design, four of them were prospective cohorts, which helped establish temporality. Moreover, from the included papers, three articles [34, 53, 54] measured health outcomes according to the severity of the exposition and their findings suggest a dose-effect association. In line with this, the study by Priest et al., (2012) found a higher and significant association between carer’s and householder’s experience of racism and children presenting 2–4 illnesses during the last two weeks compared to children presenting 0–1 illness . Similarly, a study including 40,000 households in the UK found that progressive exposure to racial discrimination is associated with increased adverse long-term effects on mental wellbeing . The consistency of our results with previous demonstrated dose-response association, adds supporting evidence to infer that racism leads to negative health outcomes [96, 97].
Strengths and limitations
Strengths of the present study include i) the use of meticulous database search and following standard guidelines during the review process, ii) use of the well-developed protocol with including members from indigenous community (authors KBB and JC), iii) the inclusion of four electronic databases in our search strategy plus manual search on the websites of relevant organisations and snowball technique, iv) a quality appraisal of the included studies using a widely used tool [49, 50].
One limitation of the studies included that nearly all of the studies measured the racism exposure within a 12-month timeframe and used a 4-week timeframe. Although asking explicit timeframes is deemed to be cognitively easier , restricting the time period can cause bias  since detrimental effects of racism could take a long time to exhibit and participants may not have reported traumatic experiences outside the given timeframe . Another limitation was that although the studies included large sample sizes, the samples were not necessarily representative of Aboriginal and Torres Strait Islander communities. More than 1 article [51, 52, 54, 55] used the same study as a sample source, which limits the generalisability of the results . Despite attempts to perform this review as comprehensively as possible, we might not have identified all studies available on the topic. Only quantitative studies were included, and the search process may have been subject to publication bias. Furthermore, no researchers or experts were contacted for additional studies meeting inclusion criteria that we might have missed.
Contrary to Aboriginal and Torres Strait Islander people’s definition of health, the approach used in this review separated physical from behavioural and mental health outcomes and didn’t evaluate cultural or community wellbeing. This approach was taken since we understand that this method facilitates the statistical analysis and demonstration of the impacts of racism on measurable and objective outcomes. Our research team included two members who are representatives of Aboriginal and Torres Strait Islander communities and with extensive expertise in this research field. However, this limitation highlights the need to include Indigenous methodologies in further studies to ensure that the methods and data analysis better represent Aboriginal and Torres Strait Islander people’s health conception [101,102,103]. Moreover, and even more importantly, it highlights how Indigenous participation in policy and program development is paramount to ensure that research results are translated into culturally accurate interventions that effectively improve Aboriginal and Torres Strait Islander people’s wellbeing.
Our study findings indicate that racism is strongly related to adverse effects on the mental health wellbeing. Furthermore, it was found that racism is also negatively associated with general health self-perception whilst its direct association with more specific physical health conditions might be underestimated due to lack of studies. Based on our findings, we suggest the need for the implementation of strategies to address all forms of racism against Aboriginal and Torres Strait Islander peoples as part of the efforts to bridge the health inequity in Australia. Hence, we believe that public health practitioners and policymakers could use our findings as guiding evidence to address racism in partnership with Aboriginal and Torres Strait Islander communities without any delay. We also argue the need for effective implementation of strategies against racism. More research is needed that understands racism and its impacts from an Aboriginal and Torres Strait Islander definition of health and wellbeing. Furthermore, research using longitudinal designs to study the impacts of racism on health outcomes and studies comparing outcomes among states and territories and studies comparing outcomes among states and territories is needed. Aboriginal and Torres Strait Islander-led research studies would also guide self-determined and culturally safe, tailored, and effective interventions for Aboriginal and Torres Strait Islander people.
Availability of data and materials
The datasets generated and analysed during the current study are available upon submitting a reasonable request to the corresponding author.
Body mass index
Controlled clinical trials
Chronic obstructive pulmonary disease
Disability – adjusted life years
Diabetes and related conditions in indigenous people in the darwin region
Longitudinal study of indigenous children
Preferred reporting items for systematic review
PRISMA extension for scoping reviews
Randomized controlled trials
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Kairuz, C.A., Casanelia, L.M., Bennett-Brook, K. et al. Impact of racism and discrimination on physical and mental health among Aboriginal and Torres Strait islander peoples living in Australia: a systematic scoping review. BMC Public Health 21, 1302 (2021). https://doi.org/10.1186/s12889-021-11363-x
- Aboriginal and Torres Strait Islanders
- Mental health
- Physical health
- Racial discrimination
- Scoping review