Most studies conducted thus far have been on convenience samples from hospital patients, high school or university students. These have yielded a wide range of results: between 0.1% and 1.4% of males, and between 0.3% and 9.4% of females. Studies on time trends in the prevalence of bulimia nervosa have also yielded inconsistent results. According to Gelder, Mayou and Geddes (2005) bulimia nervosa is prevalent between 1 and 2 percent of women aged 15–40 years. Bulimia nervosa occurs more frequently in developed countries and in cities, with one study finding that bulimia is five times more prevalent in cities than in rural areas. There is a perception that bulimia is most prevalent amongst girls from middle-class families; however, in a 2009 study girls from families in the lowest income bracket studied were 153 percent more likely to be bulimic than girls from the highest income bracket.There are higher rates of eating disorders in groups involved in activities which idealize a slim physique, such as dance, gymnastics, modeling, cheerleading, running, acting, swimming, diving, rowing and figure skating. Bulimia is thought to be more prevalent among Caucasians; however, a more recent study showed that African-American teenage girls were 50 percent more likely than Caucasian girls to exhibit bulimic behavior, including both binging and purging. History
Etymology
The term bulimia comes from Greek βουλιμία boulīmia, "ravenous hunger", a compound of βοῦς bous, "ox" and λιμός, līmos, "hunger". Literally, the scientific name of the disorder, bulimia nervosa, translates to "nervous ravenous hunger".
There are currently 1,400 known species of scorpions and each possesses venom glands. However, of these 1,400 species, only 25 are known to be dangerous enough to humans to potentially cause death upon envenomation. Other countries in Central America are habitat to the scorpion genus Centruroides. Species in this genus are only mildly toxic to humans even though they have ion channel-active toxins in their venom. == References ==