The mass release of migrants from UK immigration detention during the COVID-19 pandemic: what can be learned?

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Summary

Convincing international evidence demonstrates that immigration detention adversely affects mental health. During the COVID-19 outbreak, additional concerns were raised about the safety and appropriateness of immigration detention. Consequently, several hundred migrants were released en masse from UK immigration detention centres, and few new detentions took place. Over 70% fewer migrants were held in detention centres in June 2020 compared with December 2019. This large ‘natural experiment’ has demonstrated that detaining fewer migrants is possible and it provides an opportunity to review the necessity for large-scale detention for the purpose of immigration control, as well as its impact on health inequalities. Additionally, given that detainee release arrangements had already been considered unsafe prior to the pandemic, clinicians and service providers should take into consideration that many of those released may not be receiving adequate post-release continuity of care.

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Using natural experiments to evaluate population health interventions: new Medical Research Council guidance.

Peter Craig, Cyrus Cooper, David Gunnell … (2012)

Natural experimental studies are often recommended as a way of understanding the health impact of policies and other large scale interventions. Although they have certain advantages over planned experiments, and may be the only option when it is impossible to manipulate exposure to the intervention, natural experimental studies are more susceptible to bias. This paper introduces new guidance from the Medical Research Council to help researchers and users, funders and publishers of research evidence make the best use of natural experimental approaches to evaluating population health interventions. The guidance emphasises that natural experiments can provide convincing evidence of impact even when effects are small or take time to appear. However, a good understanding is needed of the process determining exposure to the intervention, and careful choice and combination of methods, testing of assumptions and transparent reporting is vital. More could be learnt from natural experiments in future as experience of promising but lesser used methods accumulates.

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Natural Experiments: An Overview of Methods, Approaches, and Contributions to Public Health Intervention Research

Peter Craig, Srinivasa Vittal Katikireddi, Alastair Leyland … (2017)

Population health interventions are essential to reduce health inequalities and tackle other public health priorities, but they are not always amenable to experimental manipulation. Natural experiment (NE) approaches are attracting growing interest as a way of providing evidence in such circumstances. One key challenge in evaluating NEs is selective exposure to the intervention. Studies should be based on a clear theoretical understanding of the processes that determine exposure. Even if the observed effects are large and rapidly follow implementation, confidence in attributing these effects to the intervention can be improved by carefully considering alternative explanations. Causal inference can be strengthened by including additional design features alongside the principal method of effect estimation. NE studies often rely on existing (including routinely collected) data. Investment in such data sources and the infrastructure for linking exposure and outcome data is essential if the potential for such studies to inform decision making is to be realized.

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Two year psychosocial and mental health outcomes for refugees subjected to restrictive or supportive immigration policies.

Zachary Steel, Shakeh Momartin, Derrick Silove … (2011)

Australia has been at the forefront of implementing immigration policies that aim to limit the flow of asylum seekers over recent decades. Two controversial polices have been the use of immigration detention for unauthorized arrivals and the issuing of temporary protection visas (TPVs) for refugees who arrived without valid visas. We conducted a longitudinal survey over 2 years commencing in 2003 of 104 consecutive refugees from Iran and Afghanistan attending a state-wide early intervention program in New South Wales. The sample included those released from immigration detention on TPVs (n = 47) and others granted permanent protection visas prior to entering Australia (PPVs, n = 57). Psychological symptoms were assessed at baseline and follow-up by the Harvard Trauma Questionnaire (HTQ), the Hopkins symptom checklist-25 (HSCL), the GHQ-30 and the Penn State Worry Questionnaires (PSWQ). English language competency, daily living difficulties and coping-related activities were also assessed. The results indicated that TPVs had higher baseline scores than PPVs on the HTQ PTSD scale, the HSCL scales, and the GHQ. ANCOVA models adjusting for baseline symptom scores indicated an increase in anxiety, depression and overall distress for TPVs whereas PPVs showed improvement over time. PTSD remained high at follow-up for TPVs and low amongst PPVs with no significant change over time. The TPVs showed a significant increase in worry at follow-up. TPVs showed no improvement in their English language skills and became increasingly socially withdrawn whereas PPVs exhibited substantial language improvements and became more socially engaged. TPV holders also reported persistently higher levels of distress in relation to a wide range of post-migration living difficulties whereas PPVs reported few problems in meeting these resettlement challenges. The data suggest a pattern of growing mental distress, ongoing resettlement difficulties, social isolation, and difficulty in the acculturation process amongst refugees subject to restrictive immigration policies. Copyright © 2011 Elsevier Ltd. All rights reserved.