Bivariate

双变量
  • 文章类型: Journal Article
    目前,在发展中国家,高危生育行为与5岁以下儿童发育迟缓之间的联系仍然是一个重大的公共卫生问题,包括埃塞俄比亚。这个问题对五岁以下儿童的健康和整体福祉构成威胁。因此,这项研究的主要目的是研究出生时高危生育行为与儿童发育迟缓状况及相关因素之间的关系.
    用于这项研究的数据是从2019年最近的埃塞俄比亚迷你人口与健康调查数据中提取的。这项研究共纳入了4969名五岁以下儿童的加权样本,并从这些样本中提取相关数据。多水平双变量分析用于评估埃塞俄比亚五岁以下儿童的出生高危生育行为与发育迟缓状况之间的关系。
    发现,在4,997名五岁以下儿童中,24%的五岁以下儿童因出生时的高危生育行为而发育迟缓。我们的研究还显示了0.2的类内相关性,表明出生和发育迟缓的高风险生育行为的20%的变异性可归因于社区之间的差异。此外,出生时的高危生育行为与5岁以下儿童的发育迟缓状态之间存在统计学上的显著关联[AOR=8.5,95%CI:(5.58,18.70)].同样,男孩出生发育迟缓的几率是女孩出生发育迟缓的估计几率的1.36倍[AOR=1.36,95%CI:(1.19,1.55)].
    这项研究发现,出生的高危生育行为与五岁以下儿童的发育迟缓状态之间存在显着统计学关联。具体来说,18岁以下母亲所生的孩子和在高均等家庭中的孩子被确定为儿童发育迟缓的主要危险因素.此外,健康相关教育,改善获得孕产妇保健的机会,和训练干预措施与出生和儿童发育迟缓期间的高危生育行为相关。该研究表明,对具有高危生殖特征的母亲所生的婴儿进行定期健康评估和早期干预对于减少5岁以下儿童发育迟缓的影响至关重要。
    UNASSIGNED: Currently, the linkage between high-risk fertility behavior of birth and the occurrence of stunting among children under the age of 5 continues to be a significant public health problem in developing countries, including Ethiopia. This issue poses a threat to the health and overall wellbeing of under-five children. Thus, the main objective of this study was to examine the association between high-risk fertility behavior of birth and the stunting status of children and associated factors.
    UNASSIGNED: The data used for this study were extracted from the recent Ethiopian Mini Demographic and Health Survey data in 2019. A total weighted sample of 4,969 under-five children was included in this study, and the relevant data were extracted from those samples. The multilevel bivariate analysis was used to assess the association between high-risk fertility behavior of birth and the stunting status of under-five children in Ethiopia.
    UNASSIGNED: It was found that, out of 4,997 under-five children, 24% of under-five children experienced stunting as a result of high-risk fertility behavior of birth. Our study also revealed an intra-class correlation of 0.2, indicating that 20% of the variability in both high-risk fertility behaviors of birth and stunting can be attributed to differences between communities. Furthermore, there was a statistically significant association between high-risk fertility behavior of birth and the stunting status of children under the age of 5 years [AOR = 8.5, 95% CI: (5.58, 18.70)]. Similarly, the stunting status of birth among boys was 1.36 times greater than the estimated odds of the stunting status of birth among girls [AOR = 1.36, 95% CI: (1.19, 1.55)].
    UNASSIGNED: This study found that there was a significant statistical association between high-risk fertility behavior of birth and stunting status of under-five children. Specifically, children born to mothers under 18 years and in households with high parity were identified as the main risk factors for child stunting. Furthermore, health-related education, improved access to maternal healthcare, and training interventions were associated with high-risk fertility behavior during birth and child stunting. The study suggests that regular health assessments and early interventions for infants born to mothers with high-risk reproductive characteristics are crucial to reducing the impact of child stunting under 5 years of age.
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  • 文章类型: Journal Article
    开发了十种新颖的分光光度法,用于对羟氯喹和扑热息痛药物进行初步检查。这些程序很简单,具体,易于使用,并提供准确准确的结果。确定是通过利用几种方法进行的,包括零阶(双波长,过零点,先进的吸收减法和频谱减法),导数(零交叉的一阶导数),比率(比率差,比率导数)和数学(双变量,联立方程,和Q吸光度)技术。根据ICH标准进行验证后,已经确定,这些方法中的每一种都达到了可接受的精度水平,重复性,鲁棒性,和准确性。证明了每种方法的优缺点,并对提出的方法和报告的方法进行了统计比较。
    Ten novel spectrophotometric approaches were developed for the initial examination of the Hydroxychloroquine and Paracetamol medications. These procedures are straightforward, specific, easy to use, and provide exact and accurate results. The determination was conducted through the utilization of several approaches, including zero order (dual wavelength, zero crossing, advanced absorption subtraction and spectrum subtraction), derivative (first derivative of zero crossing), ratio (ratio difference, ratio derivative) and mathematical (bivariate, simultaneous equation, and Q-absorbance) techniques. After undergoing validation in accordance with ICH criteria, it was established that each of these methods achieved acceptable levels of precision, repeatability, robustness, and accuracy. The advantages and disadvantages of each method are demonstrated, and the proposed and reported methodologies were statistically compared.
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  • 文章类型: Journal Article
    四个简单,具体,easy,首次开发了准确、准确的分光光度法检测环丙沙星和甲硝唑的组合,没有事先用开发的方法分离。环丙沙星和甲硝唑的测定采用先进的吸光度减法(AAS),频谱减法,双变量法和比率差分法。Precision,重复性,鲁棒性,在根据ICH建议进行验证后,所有这些程序的准确性均被确定在可接受的水平内.说明了每种方法的优缺点,并对提出的方法和报告的方法进行了统计比较。
    Four simple, specific, easy, precise and accurate spectrophotometric methods were developed for the first time to examine ciprofloxacin and metronidazole in combination, without having been separated beforehand by the developed methods. Ciprofloxacin and metronidazole were determined by utilizing advanced absorbance subtraction (AAS), spectrum subtraction, bivariate and ratio difference methods. Precision, repeatability, robustness, and accuracy were all determined to be within acceptable levels after each of these procedures underwent validation in accordance with ICH recommendations. Each method\'s benefits and drawbacks are illustrated, and the proposed and reported methodologies were statistically compared.
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  • 文章类型: Journal Article
    在具有人口代表性的中老年人样本中,很少有关于年龄相关的流体认知下降与功能能力之间的关联的研究。我们使用了两个阶段的过程(纵向因素分析,然后进行结构增长建模)来估计与年龄相关的一般流体认知变化的双变量轨迹(算术,类别流利,执行功能,和回忆记忆)和功能限制(日常活动中的困难,器乐活动,和流动性)。数据来自健康与退休研究(Waves2010-2016;N=14,489;年龄50-85岁)。认知能力在50-70岁之间平均下降-0.05SD,然后从70-85年-0.28标准差。功能限制在50-70岁之间平均增加+0.22SD,然后从70-85岁+0.68标准差。在年龄范围内观察到认知和功能变化的显着个体差异。重要的是,中年(70岁前)认知功能下降与功能限制增加密切相关(r=-.49,p<.001).中年以后,认知下降独立于功能限制的变化。据我们所知,这是第一项评估2010-2016年间HRS中引入的流体认知测量值的年龄相关变化的研究.
    There have been few studies on associations between age-related declines in fluid cognition and functional ability in population-representative samples of middle-aged and older adults. We used a two-stage process (longitudinal factor analysis followed by structural growth modeling) to estimate bivariate trajectories of age-related changes in general fluid cognition (numeracy, category fluency, executive functioning, and recall memory) and functional limitation (difficulties in daily activities, instrumental activities, and mobility). Data came from the Health and Retirement Study (Waves 2010-2016; N = 14,489; ages 50-85 years). Cognitive ability declined on average by -0.05 SD between ages 50-70 years, then -0.28 SD from 70-85 years. Functional limitation increased on average by +0.22 SD between ages 50-70 years, then +0.68 SD from 70-85 years. Significant individual variation in cognitive and functional changes was observed across age windows. Importantly, cognitive decline in middle age (pre-age 70 years) was strongly correlated with increasing functional limitation (r = -.49, p < .001). After middle age, cognition declined independently of change in functional limitation. To our knowledge, this is the first study to estimate age-related changes in fluid cognitive measures introduced in the HRS between 2010-2016.
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  • 文章类型: Journal Article
    在137对双胞胎中进行了双变量全基因组关联研究,以探索认知与血压(BP)之间的共有遗传基因座。在SNP归因之前,rs72815554与认知脉压(PP)表型显著相关(P<5×10-8),而在估算之后,4和9个SNP与认知SBP表型显著相关,和认知-PP表型,分别,包括rs72815554。存在rs10998339,rs72815554,rs11665292和rs10823231的高度连锁不平衡(LD)的SNP。此外,rs10998347、rs12153038和rs10998295具有较高的RegulomeDB得分,并且位于转录因子结合区域。rs7574283和rs58113664位于肾上腺高表达的超增强子区,动脉,心房组织,大脑,神经,等。有1108、1154、1071和1102个与认知SBP相关的基因,认知-DBP,认知-PP,和认知-平均动脉压(MAP)表型在暗示性显着关联水平(P<0.05),分别。此外,641、630、900和555通路与认知SBP相关,认知-DBP,认知-PP,和认知-MAP表型在暗示性显著关联水平(P<0.05),分别。
    A bivariate genome-wide association study was conducted in 137 pairs of twins to explore the shared genetic loci between cognition and blood pressure (BP). Before SNPs imputation, rs72815554 is significantly (P < 5 × 10-8) associated with the cognition-pulse pressure (PP) phenotype, while after imputation, 4 and 9 SNPs are significantly associated with the cognition-SBP phenotype, and cognition-PP phenotype, respectively, including rs72815554. There existed SNPs with highly linkage disequilibrium (LD) of rs10998339, rs72815554, rs11665292, and rs10823231. Besides, rs10998347, rs12153038, and rs10998295 had higher RegulomeDB scores and are located in the transcription factors binding regions. Rs7574283 and rs58113664 are located in the super-enhancer regions which are expressed highly in the adrenal gland, artery, atrial tissue, brain, nerves, etc. There are 1108, 1154, 1071, and 1102 genes associated with cognition-SBP, cognition-DBP, cognition-PP, and cognition-mean arterial pressure (MAP) phenotypes at the suggestive significant association level (P < 0.05), respectively. Furthermore, 641, 630, 900, and 555 pathways are associated with cognition-SBP, cognition-DBP, cognition-PP, and cognition-MAP phenotypes at the suggestive significant association level (P < 0.05), respectively.
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  • 文章类型: Journal Article
    评估一对或一组过程之间的幂律交叉相关性在从神经科学到金融市场的各种分析领域中具有重要意义。在大多数情况下,这样的分析在计算上是昂贵的,并且因此一旦获得整个信号就离线执行。然而,许多应用,如心理状态监测或财务预测,需要能够实时估计无标度耦合的快速算法。去趋势互相关分析(DCCA)将去趋势波动分析(DFA)推广到双变量域,已被引入作为一种旨在量化一对非平稳信号之间的幂律互相关的方法。稍后,与皮尔逊交叉相关系数类似,DCCA适应了去趋势的互相相关系数(DCCC),然而,到目前为止,还没有为这两种分析技术提供在线算法。在这里,我们介绍了一个新的公式,用于实时获取DCCA的缩放函数。此外,该公式可以通过矩阵表示法进行推广,以获得不仅一对信号之间的缩放关系,但也可以同时在一组信号之间的所有可能的对。这还包括对每个单独过程的DFA缩放函数的并行估计,因此也允许实时获取DCCC。所提出的算法在精度上匹配其离线变体,同时在执行时间方面效率更高。我们证明了该方法可用于在闭眼和睁眼休息条件下获得的多通道脑电图记录的精神状态监测。
    Assessing power-law cross-correlations between a pair - or among a set - of processes is of great significance in diverse fields of analyses ranging from neuroscience to financial markets. In most cases such analyses are computationally expensive and thus carried out offline once the entire signal is obtained. However, many applications - such as mental state monitoring or financial forecasting - call for fast algorithms capable of estimating scale-free coupling in real time. Detrended cross-correlation analysis (DCCA), a generalization of the detrended fluctuation analysis (DFA) to the bivariate domain, has been introduced as a method designed to quantify power-law cross-correlations between a pair of non-stationary signals. Later, in analogy with the Pearson cross-correlation coefficient, DCCA was adapted to the detrended cross-correlation coefficient (DCCC), however as of now no online algorithms were provided for either of these analysis techniques. Here we introduce a new formula for obtaining the scaling functions in real time for DCCA. Moreover, the formula can be generalized via matrix notation to obtain the scaling relationship between not only a pair of signals, but also all possible pairs among a set of signals at the same time. This includes parallel estimation of the DFA scaling function of each individual process as well, thus allowing also for real-time acquisition of DCCC. The proposed algorithm matches its offline variants in precision, while being substantially more efficient in terms of execution time. We demonstrate that the method can be utilized for mental state monitoring on multi-channel electroencephalographic recordings obtained in eyes-closed and eyes-open resting conditions.
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  • 文章类型: Journal Article
    调查无标度(即,分形)大脑中的功能连接最近引起了越来越多的关注。尽管已经开发了许多方法来评估功能耦合的分形性质,这些通常忽略了神经生理信号是宽带的集合,心律失常活动以及特征频率的振荡活动,如α波。虽然这种节奏成分的贡献可能会使分形连通性的估计产生偏差,它们也可能代表来自不同机制的神经活动和耦合。最近引入了不规则重采样自动光谱分析(IRASA),作为一种工具,通过统计汇总对原始信号进行重采样时获得的功率谱,来分离神经生理信号功率谱中的分形和振荡分量。几个非整数因子。在这里,我们引入多重重采样交叉谱分析(MRCSA)作为IRASA从单变量到双变量情况的扩展,即,通过应用相同的原理来分离两个同时记录的神经信号之间的交叉谱的分形分量。MRCSA不仅提供了理论上无偏的分形交叉谱(以及其谱指数)估计,而且还允许计算大脑区域之间无标度耦合的比例。作为一个示范,我们将MRCSA应用于单词生成范式中获得的人类脑电图记录。我们表明,在休息任务过渡期间,跨光谱指数以及分形耦合的比例在皮层上几乎均匀地增加,可能反映神经不同步。我们的结果表明,MRCSA可以成为表征各种认知状态的无标度连通性研究的有价值的工具,同时也可以推广到神经科学领域以外的其他应用。
    Investigating scale-free (i.e., fractal) functional connectivity in the brain has recently attracted increasing attention. Although numerous methods have been developed to assess the fractal nature of functional coupling, these typically ignore that neurophysiological signals are assemblies of broadband, arrhythmic activities as well as oscillatory activities at characteristic frequencies such as the alpha waves. While contribution of such rhythmic components may bias estimates of fractal connectivity, they are also likely to represent neural activity and coupling emerging from distinct mechanisms. Irregular-resampling auto-spectral analysis (IRASA) was recently introduced as a tool to separate fractal and oscillatory components in the power spectrum of neurophysiological signals by statistically summarizing the power spectra obtained when resampling the original signal by several non-integer factors. Here we introduce multiple-resampling cross-spectral analysis (MRCSA) as an extension of IRASA from the univariate to the bivariate case, namely, to separate the fractal component of the cross-spectrum between two simultaneously recorded neural signals by applying the same principle. MRCSA does not only provide a theoretically unbiased estimate of the fractal cross-spectrum (and thus its spectral exponent) but also allows for computing the proportion of scale-free coupling between brain regions. As a demonstration, we apply MRCSA to human electroencephalographic recordings obtained in a word generation paradigm. We show that the cross-spectral exponent as well as the proportion of fractal coupling increases almost uniformly over the cortex during the rest-task transition, likely reflecting neural desynchronization. Our results indicate that MRCSA can be a valuable tool for scale-free connectivity studies in characterizing various cognitive states, while it also can be generalized to other applications outside the field of neuroscience.
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  • 文章类型: Journal Article
    而验证性自适应设计的理论对于未经审查的数据是很好理解的,在生存试验中实施适应性设计仍然具有挑战性.常用的自适应生存检验是基于对数秩统计量的独立增量结构。这意味着一些相关的限制:一方面,基本上只有临时对数秩统计量可用于设计修改(如数据相关的样本量重新计算).此外,这些经典方法中的治疗组分配比例被假定为在整个试验期间是恒定的.这里,我们建议将独立增量方法扩展到适应性生存测试,以解决其中的一些局限性.我们提出了一种验证性的自适应双样本对数秩检验,该检验允许拒绝区域和样本大小重新计算规则不仅基于临时对数秩统计量,还有逐点生存率估计,同时。此外,在每次中期分析后,以数据相关的方式调整治疗组分配比例的可能性是开放的.在测试的排斥区域中包括逐点生存率估计器以比较生存曲线的能力可能是有吸引力的,例如,无缝阶段II/III设计。分配比率的数据依赖性调整可能有助于多臂试验,以便以最大的成功机会连续引导招募到研究臂中。该方法受到来自儿科肿瘤学的LOGIC欧洲试验的推动。分布特性是在大样本极限下使用martingale技术得出的。通过模拟研究了小样本的性质。
    Whereas the theory of confirmatory adaptive designs is well understood for uncensored data, implementation of adaptive designs in the context of survival trials remains challenging. Commonly used adaptive survival tests are based on the independent increments structure of the log-rank statistic. This implies some relevant limitations: On the one hand, essentially only the interim log-rank statistic may be used for design modifications (such as data-dependent sample size recalculation). Furthermore, the treatment arm allocation ratio in these classical methods is assumed to be constant throughout the trial period. Here, we propose an extension of the independent increments approach to adaptive survival tests that addresses some of these limitations. We present a confirmatory adaptive two-sample log-rank test that allows rejection regions and sample size recalculation rules to be based not only on the interim log-rank statistic, but also on point-wise survival rate estimates, simultaneously. In addition, the possibility is opened to adapt the treatment arm allocation ratio after each interim analysis in a data-dependent way. The ability to include point-wise survival rate estimators in the rejection region of a test for comparing survival curves might be attractive, e.g., for seamless phase II/III designs. Data-dependent adaptation of the allocation ratio could be helpful in multi-arm trials in order to successively steer recruitment into the study arms with the greatest chances of success. The methodology is motivated by the LOGGIC Europe Trial from pediatric oncology. Distributional properties are derived using martingale techniques in the large sample limit. Small sample properties are studied by simulation.
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  • 文章类型: Journal Article
    菌核病是一种坏死性真菌,在全球范围内引起破坏性的茎腐病和相关的油菜/油菜(甘蓝型油菜)的产量损失。包括在澳大利亚。如果要成功控制油菜/油菜籽中的这种疾病,对核菌病茎腐病的宿主抗性至关重要。因为文化或化学控制选项仅提供部分或零星的控制。三个油菜繁殖种群,C2、C5和C6,包括父母,F1,F2,BC1P1和BC2P2用于野外研究,目的是探索抗病性的遗传模式(基于茎病变长度,SLL),疾病与茎直径(SD)或开花天数(DTF)的遗传关系,并在早期研究中比较这些新的成年植物对硬核链球菌的茎抗性与幼苗(子叶和叶)抗性。SLL的遗传力(广义),接种后3周和5周,种群C2分别为0.57和0.73,接种后5周时C5为0.21。对于DTF,在所有三个种群中,加性遗传变异都很明显,而对于SD则没有。DTF的狭义遗传力为0.48(C2),0.42(C5)和0.32(C6)。SD,在双变量分析中,DTF和SLL均独立遗传,性状之间没有显着的遗传协方差。群体C2和C5中SLL的遗传变异完全是非加性的,接种后3周和5周SLL存在显著的非加性遗传协方差。群体C2中的世代均值分析支持复杂的上位性相互作用控制SLL的结论。几个C2和C5后代显示出较高的成年植物茎抗性,这对于在油菜/油菜中发展增强的茎抗性至关重要。虽然在这项研究中,群体C6没有显示出SLL抗性的遗传变异,在早期研究中,它在子叶和叶期显示出明显的非加性遗传变异。我们得出的结论是,宿主抗性在不同的植物生长阶段有所不同,并且必须针对每个生长阶段的抗性进行育种。在群体C2,C5和C6中,对茎中的菌核病菌具有抗性,叶片和子叶始终受到非加性效应的控制,例如复杂的上位或优势。总的来说,我们的发现与核菌病抗性的数量遗传有关,和新的,确定的高电平电阻,将使育种者能够选择/开发对硬核链球菌具有增强抗性的基因型。
    Sclerotinia sclerotiorum is a necrotrophic fungus causing devastating stem rot and associated yield losses of canola/rapeseed (Brassica napus) worldwide, including in Australia. Developing host resistance against Sclerotinia stem rot is critical if this disease in canola/rapeseed is to be successfully managed, as cultural or chemical control options provide only partial or sporadic control. Three B. napus breeding populations, C2, C5 and C6, including the parents, F1, F2, BC1P1 and BC2P2, were utilised in a field study with an objective of exploring the inheritance pattern of disease resistance (based on stem lesion length, SLL), the genetic relationships of disease with stem diameter (SD) or days to flowering (DTF), and to compare these new adult plant stem resistances against S. sclerotiorum with those of seedling (cotyledon and leaf) resistances in earlier studies. Heritability (broad-sense) of SLL, was 0.57 and 0.73 for populations C2 at 3 and 5 weeks post-inoculation, and was 0.21 for C5 at 5 weeks post-inoculation. Additive genetic variance was evident within all three populations for DTF but not for SD. Narrow sense heritability for DTF was 0.48 (C2), 0.42 (C5) and 0.32 (C6). SD, DTF and SLL were all inherited independently with no significant genetic covariance between traits in bivariate analysis. Genetic variance for SLL in populations C2 and C5 was entirely non-additive, and there was significant non-additive genetic covariance of SLL at 3 and 5 weeks post-inoculation. Generation means analysis in population C2 supported the conclusion that complex epistatic interactions controlled SLL. Several C2 and C5 progeny showed high adult plant stem resistance which may be critical in developing enhanced stem resistance in canola/rapeseed. While population C6 showed no genetic variation for SLL resistance in this study, it showed significant non-additive genetic variance at the cotyledon and leaf stages in earlier studies. We conclude that host resistance varies across different plant growth stages and breeding must be targeted for resistance at each growth stage. In populations C2, C5 and C6, resistance to S. sclerotiorum in stem, leaf and cotyledon is always controlled by non-additive effects such as complex epistasis or dominance. Overall, our findings in relation to the quantitative inheritance of Sclerotinia stem rot resistance, together with the new, high-level resistances identified, will enable breeders to select/develop genotypes with enhanced resistances to S. sclerotiorum.
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  • 文章类型: Journal Article
    Flumethasone pivalate (FP) and clioquinol (CL) formulation was developed as a prodigious remedy to cure the external ear inflammatory disorders. So, the current research introduces five smart and novel UV-spectrophotometric platforms relying on minimal mathematical manipulation steps for simultaneous green analysis of FP and CL with no preliminary separation in their formulation that suffered from the high difference of their ratio and severe spectral overlapping. These platforms involved dual-wavelength, first derivative ratio, Fourier self-deconvolution, area under the curve, and bivariate methods. The suggested platform\' linearity was observed over the concentration range of 3-42 µg/ml for FP and 1.5-8 µg/ml for CL. All suggested platforms were validated according to ICH recommendations regarding accuracy, precision, repeatability, and selectivity producing satisfactory results within the accepted limits. These platforms were represented as rapid, green, and cheap alternatives to the reported chromatographic method due to lower solvent consumption and waste generation. Furthermore, they improved the determination sensitivity of the studied drugs and enhanced the recorded data signals or its spectral resolution by the newly introduced Fourier self-deconvoluted method. The statistical comparison between the results of the suggested platforms with each other and with those of the reported method showed no significant differences between them.
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