美国人1/5听力受损 会干扰日常交流
<p><span word="About">About</span> <span word="one">one</span> <span word="in">in</span> <span word="five">five</span> <span word="Americans">Americans</span> <span word="age">age</span> 12 <span word="and">and</span> <span word="over">over</span> <span word="suffers">suffers</span> <span word="from">from</span> <span word="hearing">hearing</span> <span word="loss">loss</span> <span word="in">in</span> <span word="at">at</span> <span word="least">least</span> <span word="one">one</span> <span word="ear">ear</span> <span word="that">that</span> <span word="is">is</span> <span word="severe">severe</span> <span word="enough">enough</span> <span word="to">to</span> <span word="interfere">interfere</span> <span word="with">with</span> <span word="daily">daily</span> <span word="communication">communication</span>, <span word="US">US</span> <span word="researchers">researchers</span> <span word="said">said</span> <span word="Monday">Monday</span>.</p><p><span word="The">The</span> <span word="estimate">estimate</span> <span word="is">is</span> <span word="the">the</span> <span word="first">first</span> <span word="to">to</span> <span word="cover">cover</span> <span word="the">the</span> <span word="entire">entire</span> <span word="United">United</span> <span word="States">States</span> <span word="instead">instead</span> <span word="of">of</span> <span word="select">select</span> <span word="populations">populations</span> <span word="according">according</span> <span word="to">to</span> <span word="location">location</span> <span word="or">or</span> <span word="age">age</span>, <span word="said">said</span> <span word="the">the</span> <span word="study">study</span> <span word="authors">authors</span> <span word="from">from</span> <span word="Johns">Johns</span> <span word="Hopkins">Hopkins</span> <span word="University">University</span>.</p><p><span word="The">The</span> <span word="findings">findings</span>, <span word="published">published</span> <span word="in">in</span> <span word="the">the</span> <span word="November">November</span> 14 <span word="issue">issue</span> <span word="of">of</span> <span word="the">the</span> <span word="Archives">Archives</span> <span word="of">of</span> <span word="Internal">Internal</span> <span word="Medicine">Medicine</span>, <span word="a">a</span> <span word="publication">publication</span> <span word="of">of</span> <span word="the">the</span> <span word="Journal">Journal</span> <span word="of">of</span> <span word="the">the</span> <span word="American">American</span> <span word="Medical">Medical</span> <span word="Association">Association</span>, <span word="are">are</span> <span word="higher">higher</span> <span word="than">than</span> <span word="previous">previous</span> <span word="estimates">estimates</span> <span word="of">of</span> 21 <span word="to">to</span> 29 <span word="million">million</span> <span word="people">people</span> <span word="with">with</span> <span word="hearing">hearing</span> <span word="loss">loss</span>.</p><p><span word="The">The</span> <span word="researchers">researchers</span> <span word="took">took</span> <span word="data">data</span> <span word="from">from</span> <span word="the">the</span> <span word="National">National</span> <span word="Health">Health</span> <span word="and">and</span> <span word="Nutritional">Nutritional</span> <span word="Examination">Examination</span> <span word="Surveys">Surveys</span> (<span word="NHANES">NHANES</span>)， <span word="which">which</span> <span word="has">has</span> <span word="tracked">tracked</span> <span word="Americans">Americans</span>' <span word="health">health</span> <span word="since">since</span> 1971, <span word="and">and</span> <span word="analyzed">analyzed</span> <span word="data">data</span> <span word="from">from</span> <span word="just">just</span> <span word="over">over</span> 7,000 <span word="hearing">hearing</span> <span word="tests">tests</span> <span word="between">between</span> 2001 <span word="and">and</span> 2008.</p><p><span word="Forty">Forty</span>-<span word="eight">eight</span> <span word="million">million</span> <span word="people">people</span>, <span word="or">or</span> 20.3 <span word="percent">percent</span> <span word="of">of</span> <span word="people">people</span> 12 <span word="and">and</span> <span word="over">over</span> <span word="in">in</span> <span word="the">the</span> <span word="United">United</span> <span word="States">States</span>, <span word="have">have</span> <span word="hearing">hearing</span> <span word="loss">loss</span> <span word="in">in</span> <span word="at">at</span> <span word="least">least</span> <span word="one">one</span> <span word="ear">ear</span>; <span word="while">while</span> 30 <span word="million">million</span>, <span word="or">or</span> 12.7 <span word="percent">percent</span> <span word="of">of</span> <span word="the">the</span> <span word="population">population</span>, <span word="has">has</span> <span word="it">it</span> <span word="in">in</span> <span word="both">both</span> <span word="ears">ears</span>, <span word="they">they</span> <span word="found">found</span>.</p><p><span word="The">The</span> <span word="researchers">researchers</span> <span word="defined">defined</span> <span word="hearing">hearing</span> <span word="loss">loss</span> <span word="as">as</span> <span word="being">being</span> <span word="unable">unable</span> <span word="to">to</span> <span word="hear">hear</span> <span word="speech">speech</span> <span word="sounds">sounds</span> <span word="of">of</span> 25 <span word="decibels">decibels</span> <span word="or">or</span> <span word="less">less</span>, <span word="which">which</span> <span word="is">is</span> <span word="the">the</span> <span word="World">World</span> <span word="Health">Health</span> <span word="Organization">Organization</span> (<span word="WHO">WHO</span>) <span word="definition">definition</span> <span word="for">for</span> <span word="hearing">hearing</span> <span word="loss">loss</span>.</p><p><span word="Hearing">Hearing</span> <span word="loss">loss</span> <span word="becomes">becomes</span> <span word="more">more</span> <span word="frequent">frequent</span> <span word="as">as</span> <span word="people">people</span> <span word="age">age</span>, <span word="but">but</span> <span word="the">the</span> <span word="researchers">researchers</span> <span word="found">found</span> <span word="that">that</span> <span word="it">it</span> <span word="tended">tended</span> <span word="to">to</span> <span word="happen">happen</span> <span word="less">less</span> <span word="often">often</span> <span word="in">in</span> <span word="women">women</span> <span word="than">than</span> <span word="in">in</span> <span word="men">men</span>, <span word="and">and</span> <span word="was">was</span> <span word="also">also</span> <span word="less">less</span> <span word="frequent">frequent</span> <span word="in">in</span> <span word="blacks">blacks</span> <span word="than">than</span> <span word="whites">whites</span>.</p><p><span word="Researchers">Researchers</span> <span word="are">are</span> <span word="not">not</span> <span word="sure">sure</span> <span word="why">why</span>, <span word="but">but</span> <span word="they">they</span> <span word="suggested">suggested</span> <span word="that">that</span> <span word="the">the</span> <span word="potential">potential</span> <span word="protective">protective</span> <span word="effects">effects</span> <span word="of">of</span> <span word="the">the</span> <span word="female">female</span> <span word="hormone">hormone</span> <span word="estrogen">estrogen</span> <span word="and">and</span> <span word="the">the</span> <span word="skin">skin</span> <span word="pigment">pigment</span> <span word="melanin">melanin</span> <span word="should">should</span> <span word="be">be</span> <span word="investigated">investigated</span> <span word="as">as</span> <span word="potential">potential</span> <span word="reasons">reasons</span>.</p>
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