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並前往https://scholars.lib.ntu.edu.tw/handle/123456789/64095/browse?type=subject&order=ASC&rpp=20&value=objective%3A+this+study+investigated+the+prevalence+and+changing+trends+of+mental+disorders+and+the+effects+of+gender+and+urbanization+among+adolescents+in+taiwan.+method%3A+a+random+sample+of+seventh-grade+students+%28+n%3D1%2C070%29+was+recruited+from+one+urban+and+one+rural+junior+high+school+in+which+1%2C051+%2898.2%25%29+and+1%2C035+%2896.7%25%29+were+reassessed+in+the+second+and+third+years%2C+respectively.+a+two-stage+case+identification+was+conducted+by+mental+health+professionals+with+the+schedule+for+affective+disorders+and+schizophrenia+for+school-age+children%E2%80%94epidemiologic+version%2C+supplemented+by+information+from+the+child+behavior+checklist.+results%3A+the+weighted+3-month+prevalence+rates+across+the+3+consecutive+years+for+overall+psychiatric+disorders+were+20.+3%25%2C+22.7%25%2C+and+14.8%25%2C+respectively.+the+most+prevalent+psychiatric+condition+was+attention+deficit+hyperactivity+disorder+%28adhd%29+in+the+first+2+years+and+substance+use+disorders+in+the+third.+during+the+3+years%2C+the+rates+for+adhd%2C+specific+phobia%2C+and+social+phobia+decreased%2C+and+the+rates+for+major+depression+and+substance+use+disorders%2C+conversely%2C+increased.+although+conduct+disorder%2C+adhd%2C+and+substance+use+disorders+were+more+prevalent+among+boys+%2C+the+rates+for+major+depression%2C+social+phobia%2C+specific+phobia%2C+and+adjustment+disorder+were+higher+among+girls.+rural+adolescents+had+higher+rates+of+conduct+disorder%2C+oppositional+defiant+disorder%2C+and+substance+use+disorders+than+their+urban+counterparts.+conclusions%3A+our+findings+are+similar+to+those+of+previous+studies+among+adolescents+in+prevalence+rates%2C+changing+trends+of+most+mental+disorders%2C+and+gender+effects.+the+differential+changing+trends+in+various+diagnostic+groups+may+imply+the+importance+of+specific+measures+for+prevention+during+adolescence.