In patients with chronic idiopathic urticaria, approximately 35% will experience episodes of angioedema and 25% are positive for dermatographism. Like many autoimmune diseases, chronic idiopathic urticaria has a higher incidence in women than men, with the reported ratio of females to males ranging from 2:1 to 4:1.
Best Answer: Many different tribes, the original slaves brought over by the Portuguese and sold to the Spanish came from the Congo and Angolan regions of central Africa, the Windward Coast and Senegambia to the north. When the British conquered Jamaica the slaves were set free and settled in the interior. They were known as the Maroons and guarded their freedom so fiercely that the British made treaties with them. Those brought in by the British came mostly from west Africa, the Gold Coast and Windward Coast. While some will have been from the local tribes (apparently kidnapping by unscrupulous traders was common) others will have been captives from raids into the interior.
Slightly more slaves came from the Nigerian coast than from Angola in the eighteenth century, while in the nineteenth century perhaps 30 percent of all slaves sent across the Atlantic came from Nigeria. Over the period of the whole trade, more than 3.5 million slaves were shipped from Nigeria to the Americas. Most of these slaves were Igbo and Yoruba, with significant concentrations of Hausa, Ibibio, and other ethnic groups. In the eighteenth century, two polities--Oyo and the Aro confederacy--were responsible for most of the slaves exported from Nigeria.