Aphthous stomatitis countries. Within nations, it is more common in higher socioeconomic groups. Males and females are affected in an equal ratio, and the peak age of onset between 10 and 19 years. About 80% of people with aphthous stomatitis first developed the condition before the age of 30. There have been reports of ethnic variation. For example, in the United States, aphthous stomatitis may be three times more common in white-skinned people than black-skinned people. "Aphthous affectations" and "aphthous ulcerations" of the mouth are mentioned several times in the treatise "Of the Epidemics" (part of the Hippocratic corpus, in the 4th
Body image (medicine) have positive FAI values (overestimating their weight) while men had negative FAI values (underestimating their weight) Body image (medicine) Body image is a medical term, often used in the context of describing a patient's cognitive perception of their own body. The medical concept began with the work of the Austrian neuropsychiatrist and psychoanalyst Paul Schilder, described in his book "The Image and Appearance of the Human Body" first published in 1935. In psychology, it typically refers to one's perceptions, beliefs, and emotional attitudes towards one's body. The concept is used to discuss various pathologies and disorder, such as anorexia nervosa