六种常见的条件系统聚类法比较

目的探讨六种常见的条件系统聚类法的性质,并选择一到两个适于二维有序样品聚类的样品个数比较均匀的条件系统聚类法.方法用六种条件系统聚类法对一二维有序样品的资料进行聚类,根据拟定的判断准则及构造的判断函数对结果进行选择.结果按照准则选择了最长距离法和离差平方和法为较好的二维有序样品的条件系统聚类法.结论在二维有序的条件约束下,六种系统聚类法的聚类性质并未发生改变.     

影响大规模疫苗接种的社会经济因素分析

目的 了解影响成人疫苗接种率的有关社会经济影响因素。方法 选择广西河池市2个城镇，对5～60岁登记在册居民按有对照的组群随机抽样原则进行伤寒Vi疫苗和A群流脑疫苗的大规模接种；比较接种者的人口学和社会经济特征与接种率的关系。结果 应接种对象118071人，实际接种92476人，接种率为78．32％，其中伤寒Vi疫苗76．87％；流脑疫苗79．69％。城市接种率为77．29％，农村接种率为80．58％；5～9岁接种率最高，为89．65％；20～29岁组最低，仅为69．07％；男女接种率分别为79．07％和82．11％；高收入住户人群接种率最高达到90％左右；18～60岁人群中，按受教育程度分析以“小学毕业”人群接种率最高，为78．34％；按居住单元分析，学生的人群接种率最高，达92．01％，私营业主和退休人群接种率最低，分别为69．71％和68．82％；居住未满1年者的人群接种率最低．为62．5％．居住1～2年者接种率最高，为84．47％。结论 受教育程度、经济收入、居住年限以及城乡差别对接种率并无直接影响；流动性大、老年人是影响疫苗接种率的主要因素。     

陕西省医疗资源分布的聚类分析研究

运用统计学原理和方法对收集的数据进行整理，建立了由7组指标构建的评价体系，定量地评价了2002年陕西省各个地区的医疗资源分布状况，为进一步合理配置陕西省医疗资源提供了依据。     

运用系统聚类法综合评价农村社区卫生服务中心功能

目的综合评价农村社区卫生服务功能。方法系统聚类分析。结果把58个乡镇分成好、中、差3类。结论转变农村乡镇卫生院服务模式,从社区卫生服务的医疗、预防、康复、保健、健康教育和计划生育指导六位一体功能出发,协调发展,全方位提高农村社区卫生服务功效。     

聚类分析方法在我国托幼机构卫生保健工作现状研究中的应用

【目的】丁解我国托幼机构卫生保健工作的整体现状，为促进托幼机构卫生保健工作提供参考。【方法】通过分层整群抽样调查了31个省（自治区、直辖市）8966所托幼机构，采用聚类分析方法对其中27个省（市、自治区）托幼机构卫生保健工作进行分析。【结果】①27个省（市、自治区）的村级以上托幼机构（简称城市园）卫生保健工作整体分为三类：第1类包括6个省份，保健医配备率平均为96．0％（采用中位数）；第2类包括20个省份，保健医配备率平均为68．5％；第3类包括1个省份，保健医配备率为32．0％。②27个省（市、自治区）的村级托幼机构（简称农村园）卫生保健工作整体可分三类。第1类有1个省份，保健医配备率为31．6％；第2类包括24个省份．保健医配备率平均为12．2％；第3类包括2个省份。保健医配备率仅为2．7％。【结论】①1个省份的城市园的卫生保健状况和农村园的卫生保健状况相当。②要重视农村地区的托幼机构卫生保健制度的执行。     

Accuracy of Electrode Position in Sphenopalatine Ganglion Stimulation in Correlation With Clinical Efficacy

IntroductionSphenopalatine ganglion (SPG) stimulation is an efficient treatment for cluster headache. The target for the SPG microstimulator in the pterygopalatine fossa lies between the vidian canal and foramen rotundum, ideally two contacts should be placed in this area. However, placement according to the manufacturers recommendations is frequently not possible. It is not known whether a suboptimal electrode placement interferes with postoperative outcomes.Materials and MethodsSPG stimulation was performed in 13 patients between 2015 and 2018 in a single center. Lead location was determined by intraoperative computed tomography scan and correlated with the planned lead position as well as clinical data and stimulation parameters. Patients with a reduction of 50% or more in pain intensity or frequency were considered responsive.ResultsEleven patients (84.6%) responded to SPG stimulation with eight being frequency responders (61.5%). In seven cases, there were less than two electrodes between vidian canal and foramen rotundum, there was no significant correlation with negative stimulation results (p = 0.91). The mean distance of lead location between pre- and postoperative images did not correlate with clinical outcomes (p = 0.84) and was even bigger in responders (4.91 mm vs. 4.53 mm). The closest electrode contact to the vidian canal was in the stimulation area in all but one patient, regardless of its overall distance to canal. The distance of the closest electrode to the vidian canal was, however, not significantly correlated to the percentage of frequency (p = 0.68) or intensity reduction (p = 0.61).ConclusionThere was no significant correlation regarding aberrations of lead position from the planned position with clinical outcome. However, this study might be underpowered to detect such a correlation. The closest electrode contact to the vidian canal was in the stimulation area in all but one patient in the final programming. This indicates that, overall, the lead location does play a crucial role in SPG stimulation for cluster headache.     

Cluster of Ebola Virus Disease,Bong and Montserrado Counties,Liberia

Lack of trust in government-supported services after the death of a health care worker with symptoms of Ebola resulted in ongoing Ebola transmission in 2 Liberia counties. Ebola transmission was facilitated by attempts to avoid cremation of the deceased patient and delays in identifying and monitoring contacts.     

Magnetic resonance imaging accurately tracks kidney pathology and heterogeneity in the transition from acute kidney injury to chronic kidney disease

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Morphology cluster and prediction of growth of human brain pyramidal neurons

Predicting neuron growth is valuable to understand the morphology of neurons, thus it is helpful in the research of neuron classification. This study sought to propose a new method of predicting the growth of human neurons using 1 907 sets of data in human brain pyramidal neurons obtained from the website of NeuroMorpho.Org. First, we analyzed neurons in a morphology field and used an expectation-maximization algorithm to specify the neurons into six clusters. Second, naive Bayes classifier was used to verify the accuracy of the expectation-maximization algorithm. Experiment results proved that the cluster groups here were efficient and feasible. Finally, a new method to rank the six expectation-maximization algorithm clustered classes was used in predicting the growth of human pyramidal neurons.