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Sensitivity also varies with frequency, as shown by equal-loudness contours. Routine investigation for hearing loss usually involves an audiogram which shows threshold levels relative to a normal. Several animal species can hear frequencies well beyond the human hearing range. Some dolphins and bats, for example, can hear frequencies over 100 kHz.
Starting in 2000, Gary ran the Young Life Research clinic in Springville, Utah. After settling a lawsuit in 2005, the clinic was closed, and he opened a clinic in Ecuador, practicing medicine and performing surgery there, over concerns from Young Living's COO, David Stirling. [2] He also opened his first international farm in Ecuador in 2006. [3]
Women enter menopause. Hearing loss: By age 75, 48% of men and 37% of women have lost at least some significant hearing. Of the 26.7 million people [where?] over age 50 with a hearing impairment, one seventh use hearing aids. [56] In the 70–79 age range, partial hearing loss affecting communication rises to 65%, mostly in low-income men. [67]
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A frequency distribution shows a summarized grouping of data divided into mutually exclusive classes and the number of occurrences in a class. It is a way of showing unorganized data notably to show results of an election, income of people for a certain region, sales of a product within a certain period, student loan amounts of graduates, etc.
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A study of a population of French women from 1670 and 1789 shows that those who married at age 20–24 had 7.0 children on average and 3.7% remained childless. Women who married at age 25–29 years had a mean of 5.7 children and 5.0% remained childless. Women who married at 30–34 years had a mean of 4.0 children and 8.2% remained childless. [20]
[5] [6] Age affects high frequencies more than low, and men more than women. One early consequence is that even young adults may lose the ability to hear very high frequency tones above 15 or 16 kHz. [ 3 ]