共查询到19条相似文献，搜索用时 46 毫秒
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利用SPSS计算机软件的PCA-Q分析程序,从分析7项生长发育指标的相似与相异点入手,对我国22个省市区的44个汉族城乡女青少年样本进行聚类分析。分析结果表明,各地区女青少年在生长发育状况上存在着显著差异,这些差异与地理因素、城乡差别和社会经济发展水平有关。表现为北方女青少年的体格生长水平普遍高于南方,城市高于农村,经济发达地区高于相对欠发达地区。作者并就本结果在了解中国青少儿生长发育状况及趋势方面的作用,以及PCA-Q分析程序的实际应用体会进行了讨论。 相似文献
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山东省儿童青少年生长发育20年变化趋势 总被引：2，自引：1，他引：2
为了解近20年来山东省儿童青少年生长发育的变化趋势, 本文利用山东省1985年、1995年和2005年学生体质调研资料, 分析了7—18岁儿童青少年生长的长期变化。20年间, 7—18岁身高平均增长6.27cm(城男)、5.02cm(城女)、7.62cm(乡男)、5.69cm(乡女); 体重平均增长9.97kg(城男)、6.02kg(城女)、7.96kg(乡男)、4.87kg(乡女)。BMI明显增长, 7—18岁平均增长2.57kg/m2(城男)、1.46kg/m2(城女)、1.71kg/m2(乡男)、0.93kg/m2(乡女)。发育水平上的城乡差别依然存在, 但身高的城乡差别逐步缩小, 体重的城乡差别明显扩大。下肢长指数(身高—坐高)的增长幅度大于坐高的增长幅度。总之,1985—2005年的20年间,山东省7—18岁儿童青少年在身高、体重、BMI和身材比例等方面都发生了较大变化。 相似文献
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中国沿海11省市儿童青少年的生长发育状况 总被引：9，自引：1，他引：9
本文分析了2000年中国辽宁、河北、天津、山东、江苏、上海、浙江、福建、广东、广西、海南11个沿海省市城乡7—18岁儿童青少年的生长发育状况和1985—2000年生长的长期变化趋势,辽宁、河北、天津、山东、江苏、上海、浙江7省市儿童少年身高、体重、胸围、BMI的发育水平和生长的长期变化高于全国平均水平,海南、广东、广西低于全国平均水平。总体上沿海省市儿童少年的发育水平好于全国平均水平,但地域特征相当明显,东部沿海省市儿童少年的发育水平和长期变化强度都明显高于南部沿海省市。 相似文献
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温度对三化螟生长发育的影响 总被引：3，自引：0，他引：3
<正> 温度是影响三化螟Tryporyza incertulas(Walker)种群系统重要的边界因子之一,它对三化螟的生长及其种群数量变动有着重要的作用,蔡邦华、林郁等和张坚都曾进行过这方面的研究;本文在上述研究的基础上,更详细地研究了温度对三化螟各虫期生长发育的作用,这将有助于对三化螟种群系统进行模拟和控制。 材料和方法 一、供试虫源和幼虫饲养 相似文献
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<正> 水稻生育期对三化螟Sciropophaga ince-rtulas(Walker)生长发育有很明显的影响。根据这一结果,在三化螟综合防治措施中,提出了利用水稻对三化螟生长发育不利的生育期来避开三化螟卵盛孵期,以减轻三化螟的为害;具体做法是早稻利用早熟稻早播、早植,使它提前齐穗,以避开第二代三化螟的为害。我们通过田间试验对比调查了三化螟对早、迟熟水稻的为害情况,及其对三化螟生长发育和种群数量变化趋势的影响。 相似文献
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Ji Chengye 《人类学学报》1991,10(04):314
This study was designed to study the mor phological differences and sim?ilarities of Chi-nese minority nationalities girls by using princi pal component analysis combining with clusteranalysis. The data. consisted of 32 groups from 27 minority nationalities (each of the five ofthese nationalities had an urban group besides the rural one), and in each group, seven anth-ropometric measures and indices· were used for analysing.These groups merged into seven clusters and showed significant variations of growth and development. with each other. The factors which caused these variations, such as the geography, ecology, socio- economics and lifestyles as well as the urban-rural difference, were investigated. The different growth characteri-stics among different nationalities and some strategies of improving their growth were also dis-cussed by the author. 相似文献
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按月采样,分析测定虫草蝠蛾幼虫体微量元素的组成。应用Q模式系统聚类方法,分析了幼虫受环境影响引起的元素代谢变化。结果表明虫体所含元素与环境温度的变化及自身的生理活动密切相关。5、10月份幼虫组的元素含量相近,前者正当幼虫结束休眠后恢复活动的时期,后者是幼虫处于准备进入越冬的前期,两组幼虫此时均处于取食高峰期。3、4月份组的亦较接近,幼虫正渐恢复活动但不取食。8月份幼虫蜕皮前后,消耗较大,需摄取大量食物。计算结果表明7、9月份的元素含量接近,这与上述现象有一定联系;应用对应因子分析法得到的结果是:元素Fe、P对10、11月份幼虫组的贡献值显著;Na、Ca、Mg对8、9月份的贡献值显著;Cu、Zn、Co、Cd、Si对4、5月份的贡献值显著。 相似文献
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Lars R. Bergman Bassam M. El-Khouri 《Biometrical journal. Biometrische Zeitschrift》1999,41(6):753-770
An approach is presented for studying individual pattern development in person-oriented terms focusing on the concept of i-state, i.e. an individual's configuration of information at a specific point in time. The procedure is called I-States as Objects Analysis (ISOA). First common i-states (typical states) are identified using cluster analysis of subindividuals and then this information is used for describing typical developmental patterns. Both a general procedure and a specific procedure used on a demonstration data set were developed. Using ISOA, change and stability can be studied both with regard to structure and with regard to individual variation. An empirical example was given which concerned longitudinal data about school grades at four different ages for 333 boys and girls. The data were split into a test sample and a replication sample of equal sizes. It was contended from the empirical study that ISOA functioned reasonably well on the sample studied. In the discussion, it was pointed out that ISOA can be a powerful method to use for small samples with many measurement occasions and that the method is optimal for studying short-term change. 相似文献
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In this paper a cluster analysis is applied to an input-state-output indicator framework that represents the interconnection of the three aspects of sustainability, namely environmental, social and economic. This framework is a useful and comprehensive tool for assessing country performances over time and improving guidelines for the classification of countries under a sustainability perspective. The method enables identification of trends and traps that characterize the evolution of countries over time. The analysis is performed for 83 countries in 2000 and 2008 in order to observe system behaviour and development patterns. 相似文献
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ZHANG Ying-xiu 《人类学学报》2009,28(01):57
By using data of the Shandong Province survey of studentsπphysical fitness and health from the years 1985, 1995 and 2005, the secular growth change of children and adolescents aged 7-18 were analyzed. In the past 20 years, the overall increments were 6.27cm (Urban male) , 5.02cm (Urban female), 7.62cm (Rural male) and 5.69cm (Rural female) for stature, and 9.97kg (Urban male), 6.02kg (Urban female) , 7.96kg (Rural male) and 4.87kg (Rural female) for weight, and 2.57kg/㎡ (Urban male), 1.46kg/㎡ (Urban female), 1.71kg/㎡ ( Rural male) and 0.93kg/㎡ ( Rural female) for body mass index. The difference of stature level between Urban and Rural youngster was reduce and body weight was increase. The increment of legs length index is bigger than sitting height. 相似文献
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Identification of scapular dyskinesis and evaluation of interventions depend on the ability to properly measure scapulothoracic (ST) motion. The most widely used measurement approach is the acromion marker cluster (AMC), which can yield large errors in extreme humeral elevation and can be inaccurate in children and patient populations. Recently, an individualized regression approach has been proposed as an alternative to the AMC. This technique utilizes the relationship between ST orientation, humerothoracic orientation and acromion process position derived from calibration positions to predict dynamic ST orientations from humerothoracic and acromion process measures during motion. These individualized regressions demonstrated promising results for healthy adults; however, this method had not yet been compared to the more conventional AMC. This study compared ST orientation estimates by the AMC and regression approaches to static ST angles determined by surface markers placed on palpated landmarks in typically developing adolescents performing functional tasks. Both approaches produced errors within the range reported in the literature for skin-based scapular measurement techniques. The performance of the regression approach suffered when applied to positions outside of the range of motion in the set of calibration positions. The AMC significantly underestimated ST internal rotation across all positions and overestimated posterior tilt in some positions. Overall, root mean square errors for the regression approach were smaller than the AMC for every position across all axes of ST motion. Accordingly, we recommend the regression approach as a suitable technique for measuring ST kinematics in functional motion. 相似文献
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Ji Chengye;Yuan Jie;Xiao Jianwen;Wen Daying;Zhang Lin 《人类学学报》1992,11(03):250
This study analysed the somatotypes of 3802 Chinese urban youths aged 7 through 18 by using the Heath-Carter Somatochart Method. Comparisons of the anthropometric measures and indices which used to determine somatotypes were made between boys and girls among all theseage groups. The changing trend of endomorphic, mesomorphic and ectomor phic factors was ana-lysed, and the age and sex characteristics of somatotypic distributions were visually noted. On thebasis of plotting individual somatotypes of those aged 8, 13 and 18 in somatocharts, the diversities of somatotypes between and within age groups were described. The perspective applications of Heath-Carter Sonatochart Method in the physical anthropology and other scientificas pects werealso discussed by the authors. 相似文献