Search results for "Proportional Hazards Model"
showing 10 items of 721 documents
Size and survival of the hospitality industry: The case of Spain
2020
The aim of this study is to analyse the determinants of survival of the hospitality industry. The study pays particular attention to the size of the enterprises since the majority of Spanish hospitality enterprises are microenterprises. Two approaches are considered. The first approach uses a binary choice model to analyse the determinants of survival probability as well as the Blinder–Oaxaca decomposition, proposed by Yun (2004), to quantify the difference between enterprises according to their size and what proportion of this difference is due to observed factors or unobserved factors. The second approach is a survival analysis, carried out through the Cox proportional hazard model, whic…
Relation between Tissue Factor Pathway Inhibitor Activity and Cardiovascular Risk Factors and Diseases in a Large Population Sample.
2021
Abstract Objective Tissue factor pathway inhibitor (TFPI) is a potent anticoagulant protein in the extrinsic coagulation pathway. In the present study, we aim to identify the cardiovascular determinants for total TFPI activity and its association with cardiovascular disease (CVD) and total mortality. Methods Total TFPI activity was assessed in a selection of the population-based Gutenberg Health Study (n = 5,000). Statistical analysis was performed to identify the determinants for total TFPI activity as well as the associations with CVD and mortality. Results Multivariable linear regression analysis identified smoking (β 0.095 [0.054–0.136]) as a positive determinant for total TFPI activity…
Asymptomatic carotid lesions add to cardiovascular risk prediction.
2010
AIM To show that subclinical atherosclerosis (subclinical-ATS) of carotid arteries [intima-media thickness (IMT) or asymptomatic carotid plaque (ACP)], may provide additional information for risk stratification, in asymptomatic patients, aged greater than 45 years, with a cluster of risk factors (RFs). METHODS AND RESULTS We studied 558 asymptomatic patients (235 males). RFs for atherosclerosis were assessed and the 10-year-risk was calculated according to the Italian risk score. Doppler ultrasound of carotid arteries identified the presence of IMT greater than 0.9 mm in 183 patients and ACP in 147 patients. One hundred and fifty-three patients developed cerebrovascular or cardiovascular (C…
Can Physiological and Psychological Factors Predict Dropout from Intense 10-Day Winter Military Survival Training?
2020
Background: In the military context, high levels of physiological and psychological stress together can compromise individual&rsquo
Randomized multicenter comparison of two coatings of intramobile cylinder implants in 313 partially edentulous mandibles followed up for 5 years
2002
Intramobile cylinder (IMZ) implants with either of two coatings, hydroxyapatite (HA) or titanium plasma-flame (TPF), as distal abutments for combined tooth implant-supported restorations, were compared in 313 partially edentulous mandibles with respect to postprosthetical failure patterns and complication frequencies in a randomized multicenter clinical trial. Within the treatment protocols, the two coatings do not show evidence of different efficacy with respect to occurrence of postprosthetical integration deficiency (ID) or functional deficiency (FD). Statistical equivalence for an absolute effect of +/-15% in event-free survival could only be demonstrated for FD, not for ID, however. In…
One-year survival of demented stroke patients: data from the Dijon Stroke Registry, France (1985-2008)
2011
Background and purpose: Dementia is a frequent condition after stroke that may affect the prognosis of patients. Our aim was to determine whether post-stroke dementia was a predictor of 1-year case-fatality and to evaluate factors that could influence survival in demented stroke patients. Methods: From 1985 to 2008, all first-ever strokes were recorded in the population-based stroke registry of Dijon, France (150 000 inhabitants). Dementia was diagnosed during the first month following stroke, according to DSM-III and DSM-IV criteria. Survival was evaluated at 1 year and multivariate analyses were performed using Cox proportional hazards to identify independent predictive factors. Results…
Predicting the age at natural menopause in middle-aged women
2021
Objective To predict the age at natural menopause (ANM). Methods Cox models with time-dependent covariates were utilized for ANM prediction using longitudinal data from 47 to 55-year-old women (n = 279) participating in the Estrogenic Regulation of Muscle Apoptosis study. The ANM was assessed retrospectively for 105 women using bleeding diaries. The predictors were chosen from the set of 32 covariates by using the lasso regression (model 1). Another easy-to-access model (model 2) was created by using a subset of 16 self-reported covariates. The predictive performance was quantified with c-indices and by studying the means and standard deviations of absolute errors (MAE ± SD) between the pre…
Sauna bathing is associated with reduced cardiovascular mortality and improves risk prediction in men and women: a prospective cohort study.
2018
Background Previous evidence indicates that sauna bathing is related to a reduced risk of fatal cardiovascular disease (CVD) events in men. The aim of this study was to investigate the relationship between sauna habits and CVD mortality in men and women, and whether adding information on sauna habits to conventional cardiovascular risk factors is associated with improvement in prediction of CVD mortality risk. Methods Sauna bathing habits were assessed at baseline in a sample of 1688 participants (mean age 63; range 53–74 years), of whom 51.4% were women. Multivariable-adjusted hazard ratios (HRs) were calculated to investigate the relationships of frequency and duration of sauna use with C…
The Impact of Perioperative Blood Transfusion on Survival of Bladder Cancer Patients Submitted to Radical Cystectomy: Role of Anemia Status.
2016
Background The prognostic role of perioperative blood transfusion (PBT) in patients who underwent radical cystectomy (RC) for bladder cancer (BCa), although supported by clinical evidence, still remains to be assessed definitively. Objective To investigate the impact of PBT on RC patients for overall survival and after stratifying according to preoperative anemia status and to define whether the oncologic impact may be assumed to be a primary effect of PBT or attributed to the reduced preoperative hemoglobin (Hb) level. Design, setting, and participants A total of 1490 consecutive patients with nonmetastatic BCa who underwent RC and pelvic lymph node dissection between January 1990 and Augu…
Transfusion Need at Diagnosis or Its Development During the First Year of Diagnosis in Primary Myelofibrosis: Effect On Survival and Correlation with…
2009
Abstract Abstract 1909 Poster Board I-932 Background: The International Prognostic Scoring System (IPSS) for primary myelofibrosis (PMF) utilizes five independent predictors of inferior survival; of these, a hemoglobin level <10 g/dL has the highest impact on survival (Cervantes et al. Blood 2009;113:2895). In the current study, we examined the additional prognostic impact of transfusion need at diagnosis or becoming transfusion-dependent in the first year of diagnosis. These events were also correlated with JAK2 or TET2 mutational status. Methods: Patients were selected from the Mayo Clinic PMF database based on availability of bone marrow histology and IPSS-relevant information at diag…