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Quizlet's primary products include digital flash cards, matching games, practice electronic assessments, and live quizzes. In 2017, 1 in 2 high school students used Quizlet. [ 4 ] As of December 2021, Quizlet has over 500 million user-generated flashcard sets and more than 60 million active users.
Osteoarthritis is the most common form of arthritis, affecting about 237 million people or 3.3% of the world's population, as of 2015. [4] [12] It becomes more common as people age. [1] Among those over 60 years old, about 10% of males and 18% of females are affected. [2] Osteoarthritis is the cause of about 2% of years lived with disability. [12]
A flashcard or flash card is a card bearing information on both sides, usually intended to practice and/or aid memorization. It can be virtual (part of a flashcard software) or physical. Typically, each flashcard bears a question or definition on one side and an answer or target term on the other.
[47] [48] Joint changes, including osteoarthritis, have been used to infer occupations, but in general these are also manifestations of the aging process. [ 40 ] Markers of occupational stress, which include morphological changes to the skeleton and dentition as well as joint changes at specific locations have been widely used to infer specific ...
Osteoarthritis is a degenerative, or non-inflammatory arthritis. It is the most common type of arthritis, affecting between 19% and 30% of adults above the age of 45. It is caused by a progressive erosion of cartilage which eventually leads to bone damage. It is a polyarthritis, but it usually begins in a single joint.
Rheumatoid arthritis (RA) is a long-term autoimmune disorder that primarily affects joints. [1] It typically results in warm, swollen, and painful joints. [1] Pain and stiffness often worsen following rest. [1]