نتایج جستجو برای: recurrent events
تعداد نتایج: 442027 فیلتر نتایج به سال:
BACKGROUND Thrombosis is a pivotal event in the pathogenesis of coronary disease. We hypothesized that the presence of blood factors that reflect enhanced thrombogenic activity would be associated with an increased risk of recurrent coronary events during long-term follow-up of patients who have recovered from myocardial infarction. METHODS AND RESULTS We prospectively enrolled 1045 patients ...
Recurrent event data typically exhibit the phenomenon of intra-individual correlation, owing to not only observed covariates but also random effects. In many applications, the population may be reasonably postulated as a heterogeneous mixture of individual renewal processes, and the inference of interest is the effect of individual-level covariates. In this article, we suggest and investigate a...
The effect of event-dependent sampling of processes consisting of recurrent events is investigated when analyzing whether the risk of recurrence increases with event count. We study the situation where processes are selected for study if an event occurs in a certain selection interval. Motivation comes from psychiatric epidemiology where repeated hospital admissions are studied for patients wit...
Recurrent events are frequently encountered in biomedical studies. Evaluating the covariates effects on the marginal recurrent event rate is of practical interest. There are mainly two types of rate models for the recurrent event data: the multiplicative rates model and the additive rates model. We consider a more flexible additive-multiplicative rates model for analysis of recurrent event data...
1 Numerical Methods of Analysis in Engineering. Edited by L. E. Grinter, Macmillan Company, New York, 1949, chapter 4. s L. Fox, "Some improvements in the use of relaxation methods for the solution of ordinary and partial differential equations," Royal Soc, London, Proc, v. 190A, 1947, p. 31-59. ' L. Fox & J. C. P. Miller, "Table-making for large arguments. The exponential integral," MTAC, v. 4...
BACKGROUND The recurrence rate after deep vein thrombosis (DVT) is high and the risk factors for recurrent thromboembolic events have only been investigated on a small scale. OBJECTIVES To estimate the cumulative incidence of recurrent venous thromboembolic events after a first or a second DVT and to identify possible risk factors for recurrent venous thromboembolism. METHODS We prospective...
This paper presents the application of survival analysis methods using SAS/STAT ® to a large clinical trial, which was designed to test the treatment effect on preventing recurrent stroke and cardiovascular events. In this paper, we present the complete analysis procedure of this case study, including the model assumption check, model selection, and the utility and discussion on the Cox proport...
BACKGROUND AND PURPOSE Carotid intraplaque hemorrhage (IPH), known to be associated with plaque instability, may convey a higher stroke risk. The aim of this study was to assess whether the identification of IPH by MRI predicts recurrent clinical cerebrovascular events. METHODS Sixty-six patients with high-grade symptomatic carotid stenosis underwent MRI of the carotid arteries and were follo...
[1] In various geophysical applications, power-law interarrival times are observed between extreme events. Classical extreme value theory is based on exponentially distributed interarrivals and can not be applied to these processes. We solve for the density of the maxima of a sequence of random extreme events with any distribution of random interarrivals by applying a continuous time random max...
Background and purpose: Recurrent aphthous stomatitis (RAS) or oral aphthous are among the most common problems in adults. Stressful events could cause these ulcers. The purpose of this study was to determine the prevalence of recurrent aphthous stomatitis among students in Mazandaran University of Medical Sciences and its relationship with anxiety. Materials and methods: In this analytical cr...
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