نتایج جستجو برای: survival analysis
تعداد نتایج: 3074356 فیلتر نتایج به سال:
background: we conducted a retrospective analysis to evaluate the impact of omission of supraclavicular radiotherapy on supraclavicular failure rate and treatment outcomes in n1 breast cancer patients with evaluation of prognostic factors that affected supraclavicular recurrence free survival. methods: this study analyzed the medical records of 109 patients with n1 breast cancer. all patients u...
Aplastic anemia is a clinical syndrome in which there is peripheral blood pancytopenia due to reduced or absent production of blood cells without evidence of another marrow disorder. The disorder may be acquired or inherited like Fanconi’s anemia. In this study, survial and prognostic factors in acquired aplastic anemia is determined. This analytic cross-sectional study was done on 224 ...
Abstract Background: Esophageal cancer is often diagnosed at a stage in which the opportunity to completely cure the patients is long gone and the patient’s survival chances are very low. Different studies have estimated very different survival times for patients suffering from esophageal cancer in different parts of the country hence there is no common estimation about the survival time for c...
background: one substantial part of microarray studies is to predict patients’ survival based on their gene expression profile. variable selection techniques are powerful tools to handle high dimensionality in analysis of microarray data. however, these techniques have not been investigated in competing risks setting. this study aimed to investigate the performance of four sparse variable selec...
results age was selected as the important factor based on all 7 statistics. exclusion of age variable decreased c index from 0.75 to 0.68 and r square from 0.25 to 0.15. duration of hospitalization was important based on 4 statistics. exclusion of this variable decreased r square from 0.25 to 0.21. while gender was a useful variable in separation of patients into risk groups, its omission did n...
background traumatic brain injury (tbi) is an important public health problem throughout the world. objectives the aim of this study was to assess repeated glasgow coma scale (gcs) scores in predicting the severity of tbi and patients’ survival. patients and methods in this longitudinal study used a total sample of 239 patients, all of whom were hospitalized with traumatic brain injuries. subje...
conclusions parametric models may provide complementary data for clinicians and researchers about how risks vary over time. the weibull model seemed to show the best fit among the parametric models of the survival of hemodialysis patients. results the results of a multivariate analysis of the variables in the parametric models showed that the mean serum albumin and the clinic attended were the ...
Background & Objectives: Peritoneal dialysis is one of the most common types of dialysis in patients with renal failure. However multivariate analysis such as log- rank test and Cox have usually used to evaluate association of risk factors in survival of this group of patients, the aim of this study was to perform of Weibull, Gamma, Lognormal and Logistic Mixture cure models in survival an...
Background and purpose: Today chronic kidney disease is considered as a serious health problem in the world. In end-stage renal disease patients are dependent on replacement therapies including hemodialysis. This study investigated the 5-year survival rate of hemodialysis patients admitted to Sari Imam Khomeini Hospital. Materials and methods: This longitudinal descriptive study was perform...
Introduction: There is a lack of information on the extent of dependency between chronic diseases and the survival rate of breast cancer. Until date, none of the models proposed has determined the impact of chronic diseases on breast cancer survival. This study, therefore, aimed to investigate the impacts of chronic diseases such as diabetes, blood pressure, and endocrine di...
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