The prolonged Boko Haram crises in North-East Nigeria caused serious displacement and left the survivors with multiple psychological consequences such as Posttraumatic stress disorder (PTSD). A high prevalence rate of PTSD among Internally Displaced Persons (IDPs) has been reported across literatures. This study aimed to determine the factors that are associated with PTSD and its relationship with functional disability among IDPs in Yobe State, Nigeria. This was a cross sectional study of 450 respondents, recruited using a systematic sampling method. We used Harvard Trauma Questionnaire to screen for symptoms of PTSD and definite diagnosis made with WHO Composite International Diagnostic Interview (CIDI), PTSD Module. Hopkins Symptom Checklist was used for symptoms of depression and definite diagnosis made with CIDI Depression Module. The WHO Disability Assessment Schedule 2.0 was used to measure functional disability. There were 192 (45.5%) males and 230(54.5%) female respondents. The mean age of respondents was 39.4±18.50 years with range of 18-80 years. Significant PTSD symptoms were found among 159(37.7%) of the IDPs while Clinical interview gave a definite prevalence of 18.5%. Two hundred and forty-four (57.8%) of the respondents had disability scores in the mild range, 17.5% in the moderate range while 20.7% were in the severe range. Majority of those with disability scores in the severe range had PTSD. Factors significantly associated with PTSD were age, marital status, duration of displacement, type of abode, general living condition, self-reported general health, and disability score. A High prevalence rate of PTSD was found among IDPs and the severity of disability correlated well with having diagnosis of PTSD in the study.
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