Afghanistan has one of the largest populations per capita of persons with disabilities in the world. At least one in five Afghan households includes an adult or child with a serious physical, sensory, intellectual, or psychosocial disability. More than 40 years of war have left more than one million Afghans with amputated limbs and other mobility, visual, or hearing disabilities. Many Afghans have psychosocial disabilities (mental health conditions) such as depression, anxiety, and post-traumatic stress, which are often a direct result of the protracted conflict. Other Afghans have pre-existing disabilities not directly related to the conflict, such as those caused by polio.