Results 11 to 20 of about 180,194 (260)
Two-Level Proportional Hazards Models [PDF]
Biometrics, 2002 We extend the proportional hazards model to a two-level model with a random intercept term and random coefficients. The parameters in the multilevel model are estimated by a combination of EM and Newton-Raphson algorithms. Even for samples of 50 groups, this method produces estimators of the fixed effects coefficients that are approximately unbiased ...
Maples, Jerry J. +2 more
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Frontiers in Pharmacology, 2022 Objective: Intraplaque neovascularization is a marker of plaque vulnerability and is used to predict the risk of future vascular events in patients with symptomatic carotid stenosis; however, its association with asymptomatic carotid stenosis has not ...
Liuping Cui +10 more
doaj +1 more source
The Southern European Atlantic Diet and all-cause mortality in older adults
BMC Medicine, 2021 Background The Southern European Atlantic Diet (SEAD) is the traditional diet of Northern Portugal and North-Western Spain. Higher adherence to the SEAD has been associated with lower levels of some cardiovascular risk factors and reduced risk for ...
Adrián Carballo-Casla +7 more
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Does Atrial Fibrillation Increase the Risk of New Onset Myocardial Infarction? [PDF]
Zhongguo quanke yixue, 2022 Background Atrial fibrillation is the most obvious arrhythmia in medical practice. Atrial fibrillation has been listed as one of the eight fastest-growing causes of death since 1990.
Yujing HAO, Jie YU, Quanle HAN, Ruiying MAO, Jing YU, Lihua SONG, Shouling WU
doaj +1 more source
Three-year Survival of Women with Breast Cancer in Basrah, Iraq
Oman Medical Journal, 2020 Objectives: We sought to determine the overall observed three-year survival rate of women with breast cancer in Basrah, Iraq, and investigate the associated factors. Methods: Data was collected retrospectively from the Oncology Center registry in Basrah,
Jasim N. Al-Asadi, Sundus M. Al-Mayah
doaj +1 more source
Computational and Structural Biotechnology Journal, 2022 Background: Cox proportional hazard regression (CPH) model relies on the proportional hazard (PH) assumption: the hazard of variables is independent of time. CPH has been widely used to identify prognostic markers of the transcriptome.
Zihang Zeng +7 more
doaj +1 more source
Proportional hazards models with discrete frailty [PDF]
Lifetime Data Analysis, 2010 We extend proportional hazards frailty models for lifetime data to allow a negative binomial, Poisson, Geometric or other discrete distribution of the frailty variable. This might represent, for example, the unknown number of flaws in an item under test.
Caroni, Chrys +2 more
openaire +4 more sources
Survival analysis of irish amyotrophic lateral sclerosis patients diagnosed from 1995-2010. [PDF]
PLoS ONE, 2013 IntroductionThe Irish ALS register is a valuable resource for examining survival factors in Irish ALS patients. Cox regression has become the default tool for survival analysis, but recently new classes of flexible parametric survival analysis tools ...
James Rooney +7 more
doaj +1 more source
Moving beyond the Cox proportional hazards model in survival data analysis: a cervical cancer study
BMJ Open, 2020 Objectives This study explored the prognostic factors and developed a prediction model for Chinese-American (CA) cervical cancer (CC) patients. We compared two alternative models (the restricted mean survival time (RMST) model and the proportional ...
Lixian Li +3 more
doaj +1 more source
Impact of delayed treatment in women diagnosed with breast cancer: A population‐based study
Cancer Medicine, 2020 The impact of timely treatment on breast cancer‐specific survival may differ by tumor stage. We aim to study the impact of delayed first treatment on overall survival across different tumor stages.
Peh Joo Ho +5 more
doaj +1 more source