نتایج جستجو برای: survival model
تعداد نتایج: 2389577 فیلتر نتایج به سال:
Background: Identification of the factors influencing short term and long term survival for patients is one of the important concerns in medical society. With determining the risk factors and also health factors of a disease, valuable information can be obtained. In some cases, such as high rate of censoring, the use of standard survival models for analysis may cause to loss in some of...
In this paper, we propose an approach for the nonparametric estimation of the conditional survival function of a time to failure‎ ‎given a time-varying covariate under interval-censoring for the failure time. Our strategy consists in‎ ‎modeling the covariate path with a random effects model, ‎as is done in the degradation and joint longitudinal and survival data modeling&lrm...
Background & Objectives : Management of time-dependent variables is the advantages of survival analysis. This study compares time-dependent and -independent variables in survival analysis in culling of dairy cows. Methods: In this historical cohort, 7067 dairy cows in the Province of Tehran were recruited. Cows were followed to the next calving or culling. Data on the occurrence of healt...
background hiv and hcv infections are basic issues of many health systems. since hiv and hcv are transmitted similarly, it is common to become infected by them simultaneously. no consensus exists on the effect of hcv infection on the survival of hiv-infected patients. objectives this study aimed to investigate the issue in a relatively large cohort of patients who had a high prevalence of this ...
Background & Objectives: The Cox proportional-hazards regression and other parametric models model have achieved widespread use in the analysis of time-to-event data with censoring and covariates. However employing Bayesian method has not been widely used or discussed. The aim of this study was to evaluate the prognostic factors in using Bayesian interval censoring analysis.Methods: This cohort...
background: candida albicans is one of the most important opportunistic pathogens that suppress immunologic mechanisms of the host. it is speculated that structural and secretory proteins of c. albicans have immunomodulatory effects in cancer. objective: to evaluate the effects of c. albicans structural and secreted proteins on intratumoral cd4/cd8 ratio as well as the survival rate in balb/c t...
conclusions in this study, sick sinus syndrome and pacemaker mode followed by syncope were independently associated with increased mortality. results survival data were available for 1030 (80%) patients (median age = 71 years [5th to 95th percentile range: 26 - 86 years]) and follow-up was completed for 84.28% of them. according to the results, 56% of the patients had received dual-chamber syst...
Background and Aim: Breast cancer is one of the most prevalent cancers in women and is the second cause of mortality due to cancer in women, with lung cancer being the first. Materials and Methods: In this study we followed all the cases for 5 years, patients from West-Azerbaijan and East-Azerbaijan Provinces that diagnosed with breast cancer in 2009 and 2010 that attended to health cares. U...
Background and Objective: Due to progress in treatment, the average survival rate of the colorectal cancer (CRC) patients has been steady increasing in recent decades. The aim of this study was to evaluate the survival rate and affecting demographic factors in the Iranian patients with colorectal cancer. Materials and Methods: In this retrospective study, a total of 243 cases of CRC patients, w...
Background: We explored survival of skin cancer and its determinants in Kurdistan province of Iran. Methods: In a retrospective cohort design, we identified all registered skin cancer patients in Kurdistan Cancer Registry from year 2000 to 2009. Information on time and cause of death were obtained from Registrar’s office and information on type, stage and anatomic locations were extracted fr...
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