governmental, private, and United Nations Relief Work Agency UNRWA schools in East Jerusalem and various governorates in the West Bank. Another study showed that 28.3% of Bosnian refugee women had symptoms of PTSD three or four years after their arrival in Sweden. These women also had significantly higher risks of symptoms of depression, anxiety, and psychological distress than Swedish-born women. For depression the odds ratio was 9.50 among Bosnian women. A study by the Department of Pediatrics and Emergency Medicine at the Boston University School of Medicine demonstrated that twenty percent of Sudanese refugee minors living in the United States had a diagnosis of post-traumatic stress disorder. They were also more likely to have worse scores on all the Child Health Questionnaire subscales. In a study for the United Kingdom, refugees were found to be 4 percentage points more likely to report a mental health problem compared to the non-immigrant population. This contrasts with the results for other immigrant groups, which were less likely to report a mental health problem compared to the non-immigrant population. Many more studies illustrate the problem. One meta-study was conducted by the psychiatry department of Oxford University at Warneford Hospital in the United Kingdom. Twenty surveys were analyzed, providing results for 6,743 adult refugees from seven countries. In the larger studies, 9% were diagnosed with post-traumatic stress disorder and 5% with major depression, with evidence of much psychiatric co-morbidity. Five surveys of 260 refugee children from three countries yielded a prevalence of 11% for post-traumatic stress disorder. According to this study, refugees resettled in Western countries could be about ten times more likely to have PTSD than age-matched general populations in those countries. Worldwide, tens of thousands of refugees and former refugees resettled in Western countries probably have post-traumatic stress disorder. Malaria Refugees are often more susceptible to illness for several reasons, including a lack of immunity to local strains of malaria and other diseases. Displacement of a people can create favorable conditions for disease transmission. Refugee camps are typically heavily populated with poor sanitary conditions. The removal of vegetation for space, building materials or firewood also deprives mosquitoes of their natural habitats, leading them to more closely interact with humans. In the 1970s, Afghanese refugees that were relocated to Pakistan were going from a country with an effective malaria control strategy, to a country with a less effective system. The refugee camps were built