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Chinese Medical Journal 2015年第3期128卷 415-416页

作者： Xiang-Fei Feng Jian Sun Jun Wang Yi-Gang Li Department of Cardiology Xinhua Hospital Shanghai Jiaotong University School of Medicine Shanghai 200092 China

To the Editor： A 73-year-old man presented to Department of Cardiology at Xinhua Hospital, Shanghai Jiaotong University School of Medicine with a history of anterior wall myocardial infarction （MI） and multimorphic ventricular tachycardia （VT） in approximately September 2013. His VT burden became progressive increase despite treatment with percutaneous coronary intervention （PCI） and multiple antiarrhythmic medications such as beta blockers, amiodarone, magnesium sulfate, and so on.

关键词： non-response Post-Infarction Patient

Improved population mean estimator with exponential function under non-response

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Applied Mathematics(A Journal of Chinese Universities) 2023年第4期38卷 562-580页

作者： CerenUnal Cem Kadilar Department of Statistics Hacettepe UniversityAnkara 06800Turkey

In this article,we consider a new family of exponential type estimators for estimating the unknown population mean of the study *** propose estimators taking advantage of the auxiliary variable information under the first and second non-response cases *** required theoretical comparisons are obtained and the numerical studies are *** conclusion,the results show that the proposed family of estimators is the most efficient estimator with respect to the estimators in literature under the obtained conditions for both cases.

关键词： non-response exponential estimators sub-sampling method population mean

Predictors of non-response to cardiac resynchronization therapy implantation in patients with class Ⅰ indications: the markedly dilated left ventricular end-diastolic dimension and the presence of fragmented QRS

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Journal of Geriatric Cardiology 2019年第7期16卷 514-521页

作者： Yi-Ran HU Wei HUA Sheng-Wen YANG Min GU Hong-Xia NIU Li-Gang DING Jing WANG Ran JING Xiao-Han FAN Shu ZHANG State Key Laboratory of Cardiovascular Disease Arrhythmia CenterFuwai HospitalNational Center for Cardiovascular DiseasesChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijingChina

Background Cardiac resynchronization therapy(CRT)is a highly effective treatment in patients with a class I ***,a small proportion of the strictly selected patients still fail to *** study was designed to identify predictors of non-response in patients with class I indications for CRT and determine the non-response probability of the *** A total of 296 consecutive patients with a class I recommendation received CRT from January 2009 to January 2017 were retrospectively *** logistic regression analysis was performed to identify predictors for non-response(defined as cardiac death,heart transplantation,or HF hospitalization during 1-year follow-up).Results Among 296 patients,30(10.1%)met *** analysis demonstrated that non-response to CRT was associated with a fragmented QRS(odd ratio(OR)=2.86,95%CI:1.14–7.12;P=0.025)and left ventricular end-diastolic dimension(LVEDD)≥77 mm(OR=3.02,95%CI:1.17–7.82;P=0.022).Patients with both of the predictors had a non-response probability of 46.2%(95%CI:19.1%–73.3%).Conclusion In patients with left bundle branch block and wider QRS duration,the proportion of non-response to CRT is not low in real *** presence of the dilated LVEDD or fragmented QRS is a strong predictor of non-response to *** probability of non-response in the patients with the two predictors was 46.2%.

关键词： Cardiac resynchronization therapy Class I indication non-response Predictors

Potential predictors of non-response and super-response to cardiac resynchronization therapy

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Chinese Medical Journal 2011年第9期124卷 1338-1341页

作者： QIAO Qing DING Li-gang HUA Wei CHEN Ke-ping WANG Fang-zheng ZHANG Shu Centre of Arrhythmia Diagnosis and Treatment Fuwai HospitalChinese Academy of Medical Sciences Peking Union Medical College Beijing 100037 China

Background Although cardiac resynchronization therapy （CRT） is already an established treatment, the characteristics of patients who have an excellent response to CRT and those who get no benefit remain to be determined. The purpose of this study was to search for potential predictors of both non-response and super-response to *** Seventy-six consecutive patients who received CRT treatment were divided into group A （non-responders）,group C （super-responders） and group B （responders exclusive of super-responders）. Student＇s t test, Mann-Whitney test, Logistic regression and receiver operating characteristic curve were employed to identify potential predictors among the patients＇ demographic characteristics, clinical features, several electrocardiographic parameters before and after CRT implantation, and their pre-implant echocardiographic *** Group A had the lowest 3-month left ventricular ejection fraction （LVEF）. Group C had the smallest pre-implant left ventricular end-diastolic dimension （LVEDD）, the shortest post-implant QRS duration, the smallest 3-month LVEDD and the highest 3-month LVEF. In addition, there was a trend of gradual change in percent of left bundle branch block,severity of pre-implant mitral regurgitation, pre-implant QRS dispersion, post-implant QRS duration as well as post-implant QRS dispersion from group A to group B and from group B to group C. Multivariable Logistic analysis revealed that only pre-implant LVEDD could predict CRT super-response. A pre-implant LVEDD of 68.5 mm was the cut-off value that identified super-responders with 87.5% sensitivity and 79.7% specificity. A pre-implant LVEDD of 62.5mm identified super-responders with 50.0% sensitivity and 89.8% *** Predictors of a CRT non-response remain unclear at present. But it is credible that patients with a smaller left ventricle would have a better chance to become super-responders to CRT.

关键词： cardiac resynchronization therapy non-response super-response predictor

Estimating a Finite Population Mean under Random non-response in Two Stage Cluster Sampling with Replacement

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Open Journal of Statistics 2017年第5期7卷 834-848页

作者： Nelson Kiprono Bii Christopher Ouma Onyango John Odhiambo Institute of Mathematical Sciences Strathmore University Nairobi Kenya Department of Statistics Kenyatta University Nairobi Kenya

non-response is a regular occurrence in Sample Surveys. Developing estimators when non-response exists may result in large biases when estimating population parameters. In this paper, a finite population mean is estimated when non-response exists randomly under two stage cluster sampling with replacement. It is assumed that non-response arises in the survey variable in the second stage of cluster sampling. Weighting method of compensating for non-response is applied. Asymptotic properties of the proposed estimator of the population mean are derived. Under mild assumptions, the estimator is shown to be asymptotically consistent.

关键词： non-response Nadaraya-Watson Estimation Two Stage Cluster Sampling

Outcome after Discharge from Hospital of Children with Complicated Severe Acute Malnutrition and Predictors Factors of non-response during Outpatient Treatment, in Senegal

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Open Journal of Pediatrics 2023年第4期13卷 473-483页

作者： Abou Ba Aliou Thiongane Babacar Niang Younoussa Keïta Fatou Ly Aliou Abdoulaye Ndongo Ousmane Ndiaye Pediatric Department of Dalal Jamm National Hospital Center Dakar Senegal Institute of Social Pediatrics of Cheikh Anta DIOP University Dakar Senegal Albert Royer Children’s National Hospital Center Dakar Senegal Abass Ndao Hospital Center Dakar Senegal Pikine National Hospital Center Dakar Senegal

Introduction: Malnutrition is a public health problem. It is responsible for high morbidity and mortality in children aged 6 - 59 months. The aim of this study was to determine the outcome of children with complicated severe acute malnutrition after hospital discharge. Methods: This is a descriptive and analytical cross-sectional study conducted from March 1 to November 31, 2021 at the Albert Royer Children’s Hospital. Children discharged from hospital for complicated severe acute malnutrition were included. Results: A total of 103 children were included. The mean age of children at hospitalization was 16.41 ± 10.11 months and mean duration of follow-up after hospital discharge was 29.63 ± 8.59 months. Three children (2.91%) died after hospital discharge. The mean z-score of the weight-for-current height was -1.34 ± 1.08. Almost a quarter (24.27%) of the children remain acute malnourished with 3.88% of severe acute malnutrition (SAM). The predictors’ factors associated with non-response were weaning before 2 years of age (ORaj: 12.21;95% CI [6.82 - 18.44];p = 0.04) and tuberculosis (ORaj: 21.06;95% CI [12.54 - 41.09];p = 0.03). Conclusion: The rate of recovery of nutritional status in children with complicated severe acute malnutrition is satisfactory. Ablactation before the age of two and the existence of tuberculosis are significantly associated with non-recovery of nutritional status.

关键词： Children Severe Acute Malnutrition Recovery non-response

Compromise Allocation for Combined Ratio Estimates of Population Means of a Multivariate Stratified Population Using Double Sampling in Presence of non-response

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Open Journal of Optimization 2014年第4期3卷 68-78页

作者： Sana Iftekhar Qazi Mazhar Ali Mohammad Jameel Ahsan Department of Statistics & Operations Research Aligarh Muslim University Aligarh India

This paper is an attempt to work out a compromise allocation to construct combined ratio estimates under multivariate double sampling design in presence of non-response when the population mean of the auxiliary variable is unknown. The problem has been formulated as a multi-objective integer non-linear programming problem. Two solution procedures are developed using goal programming and fuzzy programming techniques. A numerical example is also worked out to illustrate the computational details. A comparison of the two methods is also carried out.

关键词： Multivariate Stratified Sampling Compromise Allocation non-response Double Sampling Goal Programming Fuzzy Programming

Fuzzy Geometric Programming in Multivariate Stratified Sample Surveys in Presence of non-response with Quadratic Cost Function

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American Journal of Operations Research 2014年第3期4卷 173-188页

作者： Shafiullah Mohammad Faisal Khan Irfan Ali Department of Computing and Informatics Saudi Electronics University Riyadh Saudi Arabia Department of Statistics & Operations Research Aligarh Muslim University Aligarh India

In this paper, the problem of non-response with significant travel costs in multivariate stratified sample surveys has been formulated of as a Multi-Objective Geometric Programming Problem (MOGPP). The fuzzy programming approach has been described for solving the formulated MOGPP. The formulated MOGPP has been solved with the help of LINGO Software and the dual solution is obtained. The optimum allocations of sample sizes of respondents and non respondents are obtained with the help of dual solutions and primal-dual relationship theorem. A numerical example is given to illustrate the procedure.

关键词： Geometric Programming Fuzzy Programming non-response with Travel Cost Optimum Allocations Multivariate Stratified Sample Surveys

Exponential Ratio Type Estimators of Population Mean under non-response

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Open Journal of Statistics 2014年第1期4卷 97-100页

作者： Lovleen Kumar Grover Parmdeep Kaur Department of Mathematics Guru Nanak Dev University Amritsar India

This paper proposes some exponential ratio type estimators of population mean under the situations when certain observations for some sampling units are missing. These missing observations may be for either auxiliary variable or study variable. The biases and mean square errors of the proposed estimators have been derived, up to the first order of approximation. The proposed estimators are compared theoretically with that of the existing ratio type estimators defined by [1]. It has been found that the proposed exponential ratio type estimators perform better than the mean per unit estimator even for the low positive correlation between study variable and auxiliary variable. Moreover, we obtained the conditions for which our proposed estimators are better than the corresponding ratio type estimators of [1]. To verify the theoretical results obtained, a simulation study is carried out finally.

关键词： Auxiliary Variable Bias Mean Square Error non-response Simple Random Sampling without Replacement Study Variable

Choosing a Method to Reduce Selection Bias: A Tool for Researchers

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Open Journal of Epidemiology 2015年第3期5卷 155-162页

作者： Claire Keeble Graham Richard Law Stuart Barber Paul D. Baxter Division of Epidemiology and Biostatistics University of Leeds Leeds UK Department of Statistics University of Leeds Leeds UK

Selection bias is well known to affect surveys and epidemiological studies. There have been numerous methods proposed to reduce its effects, so many that researchers may be unclear which method is most suitable for their study;the wide choice may even deter some researchers, for fear of choosing a sub-optimal approach. We propose a straightforward tool to inform researchers of the most promising methods available to reduce selection bias and to assist the search for an appropriate method given their study design and details. We demonstrate the tool using three examples where selection bias may occur;the tool quickly eliminates inappropriate methods and guides the researcher towards those to consider implementing. If more studies consider selection bias and adopt methods to reduce it, valuable time and resources will be saved, and should lead to more focused research towards disease prevention or cure.

关键词： Selection Bias Participation Bias non-response Methodology