简介:摘要目的调查儿童打鼾和相关症状的发生情况。方法采取随机整群分层抽样方法应用由家长完成的问卷调查表对6999名3-14岁儿童进行调查,确定打鼾和习惯性打鼾及相关症状的发生情况。实际发放调查问卷总数为9000份,应答8150份,回收率为90.6%。有效问卷6999份。结果本组儿童打鼾现患率32.7%,男性儿童打鼾发生率(44.22%)高于女性儿童(28.58%)有显著性差异(P<0.01)。儿童打鼾现患率以3-5岁儿童相对较高为35.86%。打鼾儿童相关症状按发生率分别为注意力不集中65.66%,夜间多汗51.61%,口干咽痛5.07%,食欲减退37.09%,张口呼吸36.21%,夜醒及夜惊34.21%,慢性咳嗽31.81%,体重不增27.44%,呼吸恶臭23.56%,生长迟缓22.95%,白天困倦23.04%,遗尿17.98%。睡眠打鼾儿童相关疾病中以扁桃体肥大31.02%最常见,其次反复呼吸道感染29.89%,过敏性鼻炎16.19%,体重超重13.61%。2292名打鼾儿童有家族打鼾病史者占26.79%。结论儿童睡眠打鼾是较常见现象,持续睡眠打鼾可能影响生长发育。
简介:运用文献资料、录像观察等研究方法,对第16届世界男篮锦标赛中国队与欧美各队的各项技术指标进行了对比分析。结果表明:中国男篮平均身高达到世界强队的高度,但年龄偏小,体重不占优势,国际大赛经验较缺乏;中国男篮各项进攻技术指标弱于对手,其中进攻篮板球、助攻与对手的差距显著,失误指标略好于对手,罚球方面中国队好于对手。
简介:OnApril14,2010at07:49(Beijingtime),acatastrophicearthquakewithMS7.1occurredatthecentralQinghai-TibetanPlateau.TheepicenterwaslocatedatYushucounty,QinghaiProvince,China.Atotalof2036landslidesweredeterminedfromvisualinterpretationofaerialphotographsandhighresolutionremotesensingimages,andverifiedbyselectedfieldinvestigations.Theselandslidescoveredatotalareaofabout1.194km2.Characteristicsandfailuremechanismsoftheselandslidesarelistedinthispaper,includingthefactthatthespatialdistributionoftheselandslidesiscontrolledbyco-seismicmainsurfacefaultruptures.Mostofthelandslidesweresmallscale,causingratherlesshazards,andoftenoccurringclosetoeachother.Thelandslideswereofvarioustypes,includingmainlydisruptedlandslidesandrockfallsinshallowsandalsodeep-seatedlandslides,liquefactioninducedlandslides,andcompoundlandslides.Inadditiontostronggroundshaking,whichisthedirectlandslidetriggeringfactor,geological,topographical,andhumanactivityalsohaveimpactontheoccurrenceofearthquaketriggeredlandslides.Inthispaper,fivetypesoffailuremechanismsrelatedtothelandslidesarepresented,namely,theexcavatedtoesofslopesaccompaniedbystronggroundshaking;surfacewaterinfiltrationaccompaniedbystronggroundshaking;co-seismicfaultslippingaccompaniedbystronggroundshaking;onlystronggroundshaking;anddelayedoccurrenceoflandslidesduetosnowmeltorrainfallinfiltrationatsiteswhereslopeswereweakenedbyco-seismicgroundshaking.Besidesthemainco-seismicsurfaceruptures,slopefissureswerealsodelineatedfromvisualinterpretationofaerialphotographsinhighresolution.Atotalof4814slopefissures,withatotallengthupto77.1km,werefinallymapped.Theseslopefissuresaremainlydistributedontheslopeslocatedatthesoutheasternendofthemainco-seismicsurfacerupturezone,anareasubjecttostrongcompressionduringtheeart