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Association between distress and displacement settings: a cross-sectional survey among displaced Yazidis in northern Iraq



Globally 70.8 million people have been forcibly displaced from their homes and are at disproportionally high risk for trauma. At the time of this study, there was an estimated 1.6 million internally displaced persons (IDP) in Iraq, more than two-thirds of whom reside in private, urban settings. This study aims to understand the impact of post-displacement accommodation on mental well-being of the Yazidi minority group displaced in Iraq.


Multi-stage stratified sampling was used to randomly select IDPs in camp and out of camp settlements in northern Iraq. Standardized questionnaires evaluated factors including exposure to violence and self-reported distress symptoms (measured by Impact of Event Scale-Revised). A multi-variate linear model assessed the relationship between settlement setting and distress symptoms.


One thousand two hundred fifty-six displaced Yazidi participants were included in the study: 63% in camps and 37% out of camps. After controlling for exposure to violence, social cohesion, unemployment, and access to basic services, IDPs in camps were predicted to have a 19% higher mean distress symptom score compared to those out of camps.


This study provides a framework to investigate post-displacement accommodation as a potential intervention to improve well-being for displaced populations. With a shift towards new models of emergency and long-term housing, it is important to understand the potential and limitations of more decentralized models, and identify effective methods to maintain access to basic services while improving living conditions for both displaced populations and their host communities.

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Survey sites and sample selection

Participants for this study were selected among IDPs in out of camp (urban) and camp-based settlements in the Niveneh governorate and in the Erbil and Duhok governorates in the Kurdistan Region of Iraq (KRI). Multi-stage stratified sampling strategies were used for both population groups.. Sample size for the two population groups was determined using the sample size formulation for difference in proportions. We assumed a 90% confidence with a Z distribution, 80% power, and a difference of 20% and a design effect of 2, for a total target of 150 interviews per group. This target was adjusted by 20% for anticipated non-response and rounded for logistical purposes and equal assignment to interviewers, for a target of 200 interviews. We anticipated multiple comparisons within each population groups based on gender and known ethnic diversity. The target sample size for IDP in camps was 1800 interviews. The target sample size for IDPs out of camp was 1200.

For IDPs in camps, 15 out of 31 camps for IDPs were randomly selected proportionate to population size using the latest data from the United Nations High Commissioner for Refugees (UNHCR). Within camps, interviewers were randomly assigned to blocks of similar sizes where they used a geographic sampling method to randomly select participants. Interviews could not be completed in two of the camps because the presence of IS family members posed a security risk for the interviewers. As a result, 1575 interviews were ultimately conducted with IDPs in camps (87.5% of targeted 1800 interviews, within the 20% margin).

A similar multi-stage stratified sampling strategy was used to randomly select IDPs out of camps. Five out of 12 subdistricts were randomly selected proportionately to the out of camp population size based on the latest data from the International Organization for Migration (IOM) (mid-2018) available at the time of the survey. Within the subdistricts, 3 sites (neighborhoods) identified by IOM as hosting IDPs were randomly selected, proportionate to the IDP population size. In one subdistrict, four sites were selected due to the small population at each site. Once at the site, interviewers randomly selected a direction and approached every fifth household. If the household did not host IDPs, they were skipped. Because of the small number of IDPs present at each site, an additional 9 sites (neighborhoods) were randomly sampled, resulting in a final sample size of 1406 IDPs not living in camps (117.2% of the target).

From the two sample of IDPs (in and out of camps), only those that indicated being part of the Yazidi ethnic religious group were included in this study. The rationale for the sub-sample was to increase homogeneity in the socio-cultural background and characteristics that have been shown to be associated with mental health. Among 1575 IDPs residing in camp, 794 were Yazidis (50.4%), and 462 Yazidis were among the sampled 1406 IDPs living out of camps (32.9%).

The study protocol was reviewed and approved by Partners Human Research Committee (PHRC, Protocol #2018P001748)) and a local ad-hoc committee and local authorities in northern Iraq where the data were collected.

Data collection instruments and scale

Respondents were asked questions regarding exposures to violence, social cohesion, access to services, and household assets. Household assets were categorized as medium assets (bed, fridge, and washing machine) and extended assets (mobile phone, internet access, radio, computer, microwave, heater, car, and television) per the UNHCR Vulnerability Assessment [30].

The 22-item Impact of Event Scale-Revised (IES-R) based on a Likert scale of 0 (not at all) to 4 (in full) was used as a validated instrument to estimate subjective distress and calculate a distress score. Possible scores ranged from 0 to 88, and a score of greater than 33 has been established to be have high diagnostic accuracy for PTSD [31, 32].

Statistical analysis

Statistical analyses were performed using Stata (v15, SE). Baseline demographics were presented as medians [interquartile ranges (IQR)] for continuous variables or percentages for categorical variables and compared by post-migration settlement location using Wilcoxon rank sum or chi-square test. Given low numbers of non-response, non-response answers were treated as missing values.

Linear regression was used to assess associations between distress scores and settlement location. Exposure to violence variables were converted into binary variables in regression to reflect any history of past exposure. Social cohesion variables were aggregated into a score (ranging from 1 to 29), with 1 indicating the least amount and 29 the highest amount of social cohesion. All variables associated with the outcome of interest with a p-value of < 0.2 in univariable analysis or deemed relevant to post-displacement accommodation were evaluated for inclusion in the final model. Backwards stepwise regression was then performed to derive the final multivariable model which included variables associated with a p-value of < 0.05 as well as variables forced in for known association with distress score.


General characteristics of respondents

A total of 1256 participants were included in the study; 63% of sampled respondents were living in camps and 37% were living out of camps, all in urban settings, at the time of the survey (Fig. 1).

Fig. 1
figure 1

Sampling and stratification strategies. pop = population (estimated); hh = number of household (estimated)

As shown in Table 1, the median (IQR) age of respondents was 30 (24–41), and 49% of the respondents were female; these did not differ by re-settlement location. The majority of both in camp (70%) and out of camp (73%) respondents were married at the time of the survey. In camp and out of camp respondents had similar rates of illiteracy (46 and 44% respectively), education levels, and main occupations prior to the IS attack (Table 1). Employment differed between the two groups (p = 0.002) after the IS attack with respondents living inside camps having higher rates of unemployment (29% versus 20%) and lower rates of being self-employed (14% versus 16%). Income also differed between the two groups (p = 0.02), with respondents living in camps more likely to have incomes under 300,000 IQD per month (65% versus 55%).

Table 1 Characteristics of 1256 Yazidi internally displaced persons included in this study

Exposure to violence

Complete data on exposure to 14 trauma events were assessed among respondents (Table 2).

Table 2 Comparison of exposure to violence for IDPs living in camp and out of camp

Exposure to violence was highly prevalent among the respondents during ISIS control of their governorate. Seventy-eight percent of respondents had been exposed to a combat situation, and 69% had experienced starvation/lack of nutrition. Fifty-six percent of respondents had experienced forced evacuation, 30% had been threatened with death, 23% had witnessed a killing or murder, and 16% had been tortured, and 15% had witnessed torture. Smaller percentages of respondents had been imprisoned (8%), had forced separation from family members (6%), experienced beating and/or mutilation to body (5%), developed disability as result of combat situation or landmine (4%), witnessed rape/sexual abuse (3%), been kidnapped/abducted for over a week (3%), or experienced rape or other types of sexual abuse/humiliation (2%).

Reported exposure to violence differed between Yazidi IDPs in camps and those out of camps. When looking at total past exposure, IDPs living in camps were more likely to have witnessed killing or a murder (OR 1.69, 95% CI 1.27–2.25 p < 0.001), to have witnessed beating or torture to head or body (OR 1.50, 95% CI 1.07–2.09 p = 0.02), to have experienced a combat situation (OR 1.52, 95% CI 1.16–2.00 p = 0.002), and to have been victims of torture (OR 1.61, 95% CI 1.16–2.26 p = 0.004). Rates of other exposures to violence were similar between the two groups.

Sense of community and trust

Perceptions about trust and community are shown as percentages in Table 3.

Table 3 Comparison of social cohesion measures between IDPs in camps versus out of camps

When asked about sense of safety in their current location, 94% of respondents reported that they felt safe in the location that they were residing, and 69% of them considered their current residence their home. Seventy-two percent of respondents responded that they trust the people in their current location “Quite a bit” or “Extremely.” Overall, there were high rates of positive relationships with family (95% “Good” or “Very Good”), with friends and neighbors (97% “Good” or “Very Good”), with the community in general (90% “Good” or “Very Good”), with people from other ethnic groups (81% “Good” or “Very Good”) and people from other religious groups (84% “Good” or “Very Good”). In an aggregated score looking at perception of relationships, ranging from 1(lowest) to 29 (highest), the median score was 23 (IQR 22–27).

Perceptions of community and relationships differed between the two groups. Respondents residing out of camps were more likely to trust people in their current location “Quite a Bit” (47% versus 38%) but less likely to trust people “Extremely” (27% versus 32%, p = 0.01). Respondents residing out of camps were nearly 2 times more likely to feel safe in the location of their residence (OR 1.99, 95% CI 1.08–3.67, p = 0.03). Out of camp respondents were more likely to report “Very Good” relationships with people from any other ethnic group (31% versus 26%, p = 0.049) or “Very Good” relationship with people from any other religious group (31% versus 27%, p = 0.04). In an aggregated score of social relationships, there was no difference between those residing in camps versus out of camps (p = 0.79).

Quality of life and access to services

Perceptions regarding access to basic services varied widely depending on the service or commodity. Fifty-one percent of respondents reported “Good” or “Very good” access to water, 65% reported “Average” or above access to food, 57% reported “Average” or above access to education if needed, and 57% reported “Average” or above housing quality. However, respondents were less satisfied regarding access to healthcare, ability to find employment, and access to administrative services, with 50, 88, and 68% respectively of respondents reporting “Bad” or “Very bad” access. The median number of medium assets was 3 (out of 3), and the median number of extended assets was 4 (out of 8).

The distribution of responses also differed significantly by group, with more people living out of camps describing their housing as “Very bad” compared to those in camps (18% versus 12%, p = 0.02). More respondents living out of camps also reported having “Very bad” access to food (14% versus 5%, p < 0.001), access to healthcare (19% versus 11%, p = 0.001), and access to education (16% versus 10%, p = 0.02). Both groups reported high rates of access to water (p = 0.61), and poor ability to find work/employment (p = 0.17). There was no difference in number of medium assets (p = 0.07) or extended assets (p = .26) between the groups.

Associations between accommodation and symptoms of distress

Respondents overall reported high levels of distress symptoms. The median (IQR) distress score, on a scale of 0–88, was 45 (28–57) among all respondents. Sixty-nine percent of respondents had a score greater than or equal to 33. Among IDPs living in camps, their median (IQR) distress score was 48 (31–60), and among those living out of camps median (IQR) distress score was 40 (24–53). Seventy-three percent of IDPs in camps and 64% of those out of camps had scores greater than or equal to 33 (OR 1.50, 95% CI 1.17–1.91 p = 0.001).

In univariable linear regression, residing in a camp was associated with an average of a 7.7 point (19%) increase in distress score from a predicted mean distress score of 38.75 (95% CI 5.49–9.91 p < 0.001); a complete list of results from univariable regression can be found in Table 4.

Table 4 Logistic regression

After conducting backwards stepwise regression with all variables that were associated with distress score with a p < 0.2, staying in a camp remained significantly associated with an increased in distress score on average of 7.2 points (p < 0.001), after adjusting for witnessing beating or torture, experiencing starvation/lack of nutrition, forced evacuation, disability as result of combat situation or landmine, torture, other forced separation from family members, quality of relationship with people from any other religious group, amount of trust in people in current living situation, feeling of safety in current living situation, access to food, access to healthcare, access to education, and current unemployment.


Our study found a high prevalence of distress symptoms among Yazidi IDPs living in northern Iraq, with 69% of respondents meeting a distress symptom threshold that is highly predictive of PTSD. We also found that post-displacement settlement setting (in camp compared to out of camp) was significantly associated with higher distress symptom scores, with IDPs in camps predicted to have a 19% higher mean score compared to IDPs out of camps. Even though IDPs in camps had higher rates of exposure to violence, this difference in mean distress symptom scores remained significant even after controlling for exposure to violence, social cohesion, unemployment, and access to services.

Moreover, despite IDPs out of camps having a lower prevalence of distress symptoms, they reported worse access to many important services, including access to food, healthcare, and education. Our findings are consistent with a survey conducted in 2017 as part of the Mixed Migration Platform, which found that IDPs living in private accommodations had a more negative perception of access to services compared to their counterparts living in camps [29]. Difficulties in accessing basic services and a higher rate of respondents reporting being very dissatisfied with their housing reflect the challenges of the decentralized nature of safety net services for displaced persons in out of camp settings.

These findings raise several important questions. First, the association between lower distress scores and out of camp accommodation, even after controlling for exposure to violence, may suggest that post-displacement accommodation could be viewed as an intervention in itself to reduce the severity of post-trauma sequelae. While there is a growing body of research demonstrating the importance of the built environment and physical space in impacting well-being, this is still poorly studied among displaced populations [33, 34]. Our research lays the necessary foundation for investigating this question further. Second, we observed this association despite IDPs reporting poorer access to basic services and greater dissatisfaction with their housing in out of camp settings. This highlights the ongoing conflict between prioritizing access to basic services in a centralized setting such as a camp, while upholding the dignity, autonomy, resiliency, and privacy of displaced persons. It also may suggest the relative importance of factors related to self-efficacy, such as independence and dignity, on mental health and alleviating the sequelae of trauma. Finally, our findings highlight the challenge of reduced visibility for IDPs residing in non-camp settings and how it can impede their ability to receive assistance and services. In fact, the Internal Displacement Monitoring Centre (IDMC) reported that IDPs in gathered settings, such as camps, were twice as likely to receive assistance and protection from national authorities and humanitarian actors compared to those in dispersed settings [28, 35]. Exploring creative development solutions where support can be provided to IDPs who are not in formal camp settings without overburdening host communities will be a challenge, but could be effective in addressing any pre-existing structural issues faced by host communities. Such solutions could consequently facilitate and strengthen a greater link between humanitarian actors and vulnerable populations while also promoting development for the host communities.

Our findings also highlight an important issue within an ongoing discussion around collective trauma. Many have argued that traditional Western psychological models are inadequate in the international context, and instead argue for more trans-cultural and post-modern approaches to psychological care [36]. Western models have also been critiqued for their internalized problem discourse, putting the burden of trauma on the individual and absolving society from its collective responsibility. Such an internalized problem discourse fails to acknowledge the ways in which interventions aimed at improving the socioeconomic and living conditions may be a strategy for improving mental health. Our research provides an important groundwork for thinking about such strategies.

Our study has some limitations. First, while we did not find any demographic differences among Yazidi IDPs resettled in camps versus out of camps, we do not know whether the location of post-displacement resettlement is impacted by where they were resided within Nineveh governorate pre-displacement as we did not ascertain this information. In addition, we lacked information regarding the quality of housing, such as number of individuals sharing a unit and size of unit. Furthermore, though we had a holistic survey looking at exposure to violence, it is possible that we missed exposures or did not adequately assess severity of exposure, which could have differed by post-displacement accommodation. Furthermore, we did not have information regarding time from exposure to violence, which could have impacted distress scores and potentially differed between IDPs settled in camp versus out of camp.

Despite these limitations, our study lays important groundwork to begin investigating alternatives to camp-like settlements for displaced populations to improve their well-being and positive long-term outcomes. As the humanitarian community begins to shift towards new models of emergency and long-term housing, it will also be important to understand the potential and limitations of more decentralized models, and identify effective methods to maintain access to basic services while improving conditions for both displaced populations and host communities.

Availability of data and materials

The data that support the findings of this study are available from Phuong Pham but restrictions apply to the availability of these data, which were used under license for the current study, and so are not publicly available. Data are however available from the authors upon reasonable request and with permission of Phuong Pham,



Internally displaced persons


Impact of Event Scale-Revised


International Organization for Migration


Interquartile ranges


Islamic State


Kurdistan Region of Iraq


Post-traumatic stress disorder


United Nations High Commissioner for Refugees


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The study was funded by the Netherlands Ministry of Foreign Affairs, Stabilization and Humanitarian Aid Department. The funder had no role in study design, in the collection, analysis, and interpretation of data, and in the writing of the report and the decision to submit for publication.

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Authors and Affiliations



PP and PV and AA designed the study and obtained funding; PV, AA, and KC obtained the data, LF analyzed the data with PP and PV’s guidance; LF, PP, and PV wrote initial draft. All authors contributed to data interpretation and edited the manuscript. The authors read and approved the final manuscript.

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Correspondence to Phuong N. Pham.

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The study protocol was reviewed and approved by Partners Human Research Committee (PHRC, Protocol #2018P001748)) and a local ad-hoc committee and local authorities in northern Iraq where the data were collected. All methods were carried out in accordance with relevant guidelines and regulations. All experimental protocols were approved by Partners Human Research Committee (PHRC, Protocol #2018P001748)) and a local ad-hoc committee and local authorities in northern Iraq where the data were collected. Informed consent was obtained from all subjects.

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Pham, P.N., Fozouni, L., al-Saiedi, A. et al. Association between distress and displacement settings: a cross-sectional survey among displaced Yazidis in northern Iraq. BMC Public Health 21, 679 (2021).

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