Epidemiology
Ehlers–Danlos syndromes are estimated to occur in about one in 5,000 births worldwide. Initially, prevalence estimates ranged from one in 250,000 to 500,000 people, but these were soon found to be low, as medical professionals became more adept at diagnosis. EDS may be far more common than the currently accepted estimate due to the wide range of severities with which the disorder presents.The prevalence of the disorders differs dramatically. The most common is hypermobile EDS, followed by classical EDS. The others are very rare. For example, fewer than 10 infants and children with dermatosparaxis EDS have been described worldwide. Some types of EDS are more common in Ashkenazi Jews. For example, the chance of being a carrier for dermatosparaxis EDS is one in 2,000 in the general population but one in 248 among Ashkenazi Jews. History
Until 1997, the classification system for EDS included 10 specific types and acknowledged that other extremely rare types existed. At this time, the classification system underwent an overhaul and was reduced to six major types using descriptive titles. Genetic specialists recognize that other types of this condition exist, but have only been documented in single families. Except for hypermobility (type 3), the most common type of all 10 types, some of the specific variations involved have been identified, and they can be precisely identified by genetic testing; this is valuable due to a great deal of variation in individual cases.
Tarka may refer to:

Tarka, also Chhaunk, in Indian cuisine is a method of seasoning food with spices heated in oil or ghee
Tarka, Nigeria, a Local Government Area in Benue State, Nigeria
Tarka, Niger
Tarka the Otter, a 1927 novel by Henry Williamson
Tarka Line, a railway line in Devon, England
Tarka Trail, a series of footpaths assembled from former railway lines
Tarka (medication), a brand name for an antihypertensive medication
Tarka (flute), also tharqa, a traditional flute of the Andes
David Tarka (born 1983), Australian football player
Taharqa, Nubian pharaoh of the twenty-fifth Dynasty of Egypt
Tarka (film), a 1988 Kannada language movie
Taarka, an Oregonian quartet
Tarka Cordell (1968–2008), British musician, writer and record producer
Wiesław Tarka (born 1964), Polish diplomat
The Tarka, an alien race in the video game Sword of the Stars

See also
Tarka sastra, an Indian science of dialectics, logic and reasoning