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Due to natural variation, individuals pass through the Tanner stages at different rates, depending in particular on the timing of puberty.Among researchers who study puberty, the Tanner scale is commonly considered the "gold standard" for assessing pubertal status when it is conducted by a trained medical examiner. [5]
The average age of a girl's first period is 12 to 13 (12.5 years in the United States, [6] 12.72 in Canada, [7] 12.9 in the UK [8]) but, in postmenarchal girls, about 80% of the cycles are anovulatory in the first year after menarche, which declines to 50% in the third year, and to 10% by the sixth. [9]
Diagram illustrating how the uterus lining builds up and breaks down during the menstrual cycle Menstruation (also known as a period, among other colloquial terms) is the regular discharge of blood and mucosal tissue from the inner lining of the uterus through the vagina. The menstrual cycle is characterized by the rise and fall of hormones. Menstruation is triggered by falling progesterone ...
But while it may be trendy to be able to tell someone your biological age at a party (hint: it's not your birthday), most common commercial biological aging tests using a spit sample or oral swab ...
Menstrual cycle The menstrual cycle is a series of natural changes in hormone production and the structures of the uterus and ovaries of the female reproductive system that makes pregnancy possible. The ovarian cycle controls the production and release of eggs and the cyclic release of estrogen and progesterone. The uterine cycle governs the preparation and maintenance of the lining of the ...
In very rare instances, menarche may occur at an unusually early age, preceding thelarche and other signs of puberty. This is termed isolated premature menarche, but other causes of vaginal bleeding must be investigated and excluded. [16] Isolated premature menarche is rarely the first manifestation of precocious puberty. [citation needed]
For females, it is menarche, the onset of menstruation, which occurs, on average, between ages 12 and 13. [12] [23] [24] [25] The age of menarche is influenced by heredity, but a girl's diet and lifestyle contribute as well. [12] Regardless of genes, a girl must have a certain proportion of body fat to attain menarche. [12]
Gibbs said people with these conditions should get help from someone in good health to complete the chore. But if snow shoveling must be done, shovel a little at a time, take breaks and dress ...