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Table 1 Studies on health status of UN peacekeepers

From: UN peacekeeper health and risk factors --- a systematic scoping review

Health Status

Diseases

Author/year

WHO regions: Troop-contributing countries

Host countries

Study designs

Main outcomes

Mental Health

PTSD

Ward et al. 1997 [13], Mehlum et al. 1999 [14], Bramsen et al. 2000 [15], Brarmsen et al. 2001 [16], Mehlum et al. 2002 [17], Asmundson et al. 2003 [18], Hotopf et al. 2003 [19], Forbes, 2005 [20], Bolton et al. 2006 [21], Litz et al. 2006 [22], Greenberg et al. 2008 [23], Souza et al. 2008 [24], Thoresen et al. 2008 [25], Richardson et al. 2008 [26], Richardson et al. 2009 [27], Rademaker et al. 2009 [28], Maguen et al. 2009 [29], Connorton et al. 2011 [30], Fernando et al. 2011 [31], Engdahl et al. 2011 [32], Richardson et al. 2012 [33], Giorgi et al. 2017 [34], Dixit et al. 2018 [35], Elrond et al. 2019 [36], Gjerstad et al. 2020 [37]

Western Pacific Region: Australia

Vietnam, Somalia

Medical report, Questionnaire

High PTSD scores, Substantial proportion of PTSD veterans.

Region of the Americas: U.S., Canada, Brazil

Somalia, Haiti Multination

Longitudinal study, Cohort study, Questionnaire, Longitudinal study

PTSD prevalence at Time 1 (8.2%) and at Time 2 (10.2%), PTSD severity not related to cardiovascular problems, PCL-M screening criteria for PTSD (73.6%), Veterans with PTSD, Negative affect traits on PTSS.

European Region: Norway, U.K., Netherlands, Denmark

South Lebanon, Lebanon, Multination, Bosnia, Yugoslavia, Cambodia, Afghanistan

Questionnaire, Cross-sectional study, Epidemiological study, Control groups, Cohort study, Interview

PTSD among Norwegian peacekeepers (5.2%), Service-related stress and PTSD, Watching drama relevant to their experiences, PTSD prevalence from 3.6 to 5.5%, Exposure to traumatic events contributed to PTSD, No increase in the number of PTSD, PTSD among formerly deployed soldiers.

South-East Asia Region: India, Multination

Multination, Kosovo

Cross-sectional study, Retrospective study, Questionnaire, Sample study, Interview

No cases of PTSD, Veterans who screened positive for PTSD scored higher, PTSD symptoms’ impact upon chronic pain experiences, PTSD predicted by level of anxiety and depression, PTSD symptom models and factor structure, Combat related PTSD, PTSD symptom and trauma history.

Stress

Ballone et al. 2000 [38], Wessely et al. 2006 [39], Nikolova et al. 2007 [40], Adler et al. 2008 [41], Britt et al. 2011 [42], Barnes et al. 2013 [43], Souza et al. 2015 [44], Mustafa et al. 2021 [45]

Region of the Americas: U.S.

Multination, Kosovo

Questionnaire

Stressful experience, Routine exposures cause high levels of stress, Incident stress debriefing.

European Region: Italy, Bulgaria, U.K.

Bosnia, Kosovo

Cross-sectional study, Longitudinal study, Questionnaire

High stress level during deployment, Determination and characteristics of stress, Perceived stress from professional difficulties and frustrations.

Eastern Mediterranean Region: Pakistan

Democratic Republic of Congo

Cross-sectional study

Differences between the married and unmarried peacekeepers on stress.

Multination

Multination

Questionnaire, Interview

Acute psychological stress.

Anxiety and depression

Orsillo et al. 1998 [46], Ippolito et al. 2005 [47], Wessely et al. 2006 [39], Sareen et al. 2007 [48], Jia et al. 2009 [49], Chen et al. 2010 [50], Zhu et al. 2010 [51], Zhang et al. 2010 [52], Shao et al. 2011 [53], Li et al. 2012 [54], Chen et al. 2012 [55], Chen et al. 2012 [56], Li et al. 2012 [57], Li et al. 2012 [58], Selič et al. 2013 [59], Zhang et al. 2013 [60], Sun et al. 2014 [61], Dixit et al. 2018 [35], Zhao et al. 2019 [62], Gjerstad et al. 2020 [63]

European Region: U.K., Norway, Slovenia

Bosnia, Lebanon, Kosovo

Questionnaire, Cross-sectional study

Perceived stress came from professional difficulties and frustrations.

Region of the Americas: Canada

Haiti

Cross-sectional study

Generalized anxiety disorder.

South-East Asia Region, Eastern Mediterranean Region: Pakistan, Bangladesh

Liberia

Questionnaire

Peacekeepers in two countries had different scores in mental health problems such as anxiety and depression.

South-East Asia Region: India

Multination

Cross-sectional study

Increased incidence of anxiety and depression.

Western Pacific Region: China

The Democratic Republic of the Congo, Nigeria, Sudan, Liberia, Lebanon, Namibia, Ghana, Multination

Questionnaire

The Chinese version of the Chinese Military Mental Health Scale was used to test peacekeepers’ mental status including anxiety and depression levels.

Multination

Kosovo, Somalia

Questionnaire

Generalized anxiety disorder, depression.

Psychiatric disorders

Ward et al. 1997 [13], Orsillo et al. 1998 [46], Richardson et al. 2012 [33]

Region of the Americas: Canada

Multination

Questionnaire

Self-reported psychiatric illness and suicidal ideation among peacekeepers with PTSD.

Western Pacific Region: Australia

Somalia

Questionnaire

One-fifth of Australian soldiers who served in Somalia had significant. Levels of psychiatric morbidity

Multination

Somalia

Questionnaire

Over one third of participants met criteria for psychiatric caseness.

Infectious diseases

HIV/AIDS

Hu et al. 2005 [64], Ross et al. 2006 [65], Guo et al. 2006 [66], Jin et al. 2008 [67], Lowicki-Zucca et al. 2009 [68], Assan et al. 2021 [69]

Western Pacific Region: China

The Democratic Republic of Congo, Liberia, Sudan

Medical report, Questionnaire

Reported AIDS cases among Chinese peacekeepers.

Region of the Americas: U.S.

sub-Saharan Africa

Content analyses

The exposure, vulnerability, and impact of HIV on peacekeepers.

African Region: Nigeria

West Africa

Questionnaire

Situationally focused individual HIV intervention

Multination

Multination

Prevalence comparison

HIV prevalence of the peacekeeping mission is higher than that of the host country.

Malaria and cholera

Hu et al. 2005 [64], Jeremy et al. 2005 [70], Jin et al. 2008 [67], Xie et al. 2009 [71], Wang et al. 2011 [72], Wei et al. 2011 [73], Ma et al. 2011 [74], Sun et al. 2012 [75], Juliao et al. 2013 [76], Kapoor et al. 2013 [77], Lewnard et al. 2015 [78], Fernando et al. 2016 [79], He et al. 2017 [80], Kunkel et al. 2017 [81], Fernando et al. 2017 [79], Qi et al. 2018 [82], Guerra et al. 2019 [83], Li et al. 2021 [84]

Western Pacific Region: China

Sudan, South Sudan, Liberia, The Democratic Republic of Congo

Medical report, Retrospective study, Questionnaire

The provision of care for patients with malaria and cholera.

South-East Asia Region: Sri Lanka, Nepal

The Central African Republic, Haiti, Multination

Questionnaire, Interviews, Stochastic modeling

30.8% of peacekeepers (37/120) had 44 symptomatic episodes of malaria during deployment.

European Region: U.K.

Multination

Case study

High rates of transmission of malaria.

Region of the Americas: Peru, Guatemala

The Central African Republic, The Democratic Republic of the Congo

Case study

The first imported malaria cases represent in Peru, Identifying malaria cases and risk factors for malaria acquisition.

HEV and HAV

Eastern Mediterranean Region: Egypt

The Democratic Republic of Congo

Case report

Spontaneous rupture of spleen with complicated falciparum malaria.

Multination

Haiti

Stochastic model

Cholera importation and transmission.

Drabick et al. 1997 [85], Gambel et al. 1998 [86], Li et al. 2019 [87]

South-East Asia Region: Bangladesh

Haiti

Epidemiological study

High genomic identity with Asian strains of HEV and dissimilarity with the Mexican strain.

Western Pacific Region: China

South Sudan

Case study

A life-threatening case of HAV infection.

Multination

Haiti

Questionnaire

Pakistan (62%), India (37%), Nepal (37%), Bangladesh (27%), Djibouti (13%), Honduras (6%), Guatemala (5%), Haiti (3%).

Other infectious diseases

Gambel et al. 1999 [88], Jia et al. 2018 [89], ter Meulen et al. 2001 [90], Zhao et al. 2015 [91]

Western Pacific Region: China

Africa, Liberia

Clinical study, Medical report

A live-attenuated YFV vaccine strain, EVD outbreak in West Africa.

Multination

Haiti, Sierra Leone, Australia, Central Africa

Interview, Medical report, Case study, Cohort study

Dengue, Lassa fever, Dengue, Tungiasis.

Other health problems

Adams et al. 1997 [92], Thoresen et al. 2003 [93], Hu et al. 2005 [64], Hébert et al. 2007 [94], Li et al. 2008 [95], Xie et al. 2009 [71], Sun et al. 2011 [96], Korzeniewski et al. 2011 [97], Tian et al. 2011 [98], Glad et al. 2012 [99], Sun et al. 2014 [100], Yang et al. 2014 [101], Strand et al. 2014 [102], Bolognesi et al. 2016 [103], Zhou et al. 2016 [104], Strand et al. 2016 [105], Enkhtsetseg et al. 2016 [106], Tang et al. 2017 [107], He et al. 2017 [80], Chen et al. 2018 [108], Qi et al. 2018 [82], Zhao et al. 2018 [109],Wang et al. 2018 [110], Bullman et al. 2019 [111], Qi et al. 2019 [112], Zuo et al. 2020 [113], Liu et al. 2021 [114] Korzeniewski, 2011 [115] Okulate, 2004 [116] Duarte, 2015 [117]

Western Pacific Region: China

Mali, Sudan, Lebanon, Liberia, South Sudan, The Democratic Republic of Congo

Expert consultation, Retrospective study

Respiratory diseases, Fracture, Intermittent diarrhea, Eczema, Insomnia, Mosquito bites, Trauma, Low back and leg pain, Oral ulcers, Injuries, Skin and soft tissue defects.

Oral, skin, gastrointestinal, musculoskeletal, respiratory, urinary, ophthalmic, otolaryngologic and gynecological diseases, leukemia

Region of the Americas: Canada, U.S., Brazil

Bosnia, Kosovo, Haiti

Case study, Cohort study, Medical report, Interview

Musculoskeletal injuries, Mortality (leukemia, respiratory disease, respiratory cancer, and heart disease).

European Region: Sweden, Multination, Italy, Norway, U.K., Poland

Afghanistan, Middle East, Iraq, Kosovo, Lebanon, Bosnia, Central Africa

Questionnaire, Medical report, Cohort study

Food and water-borne diseases, Leukemia, Fatal Accidents, Rubella, Non-battle injuries.

African Region: Nigeria

Yugoslavia and Liberia

Interview

Homicidal violence.