1,720,972 research outputs found
A Bayesian probabilistic record linkage method to perform survival analysis for joint prostheses when the operated side is not available
Full text linkSurveillance on implantable joint prostheses is crucial to assess performance of devices and ensure safety of patients. In data collection, unique identifiers for patients and information about the operated side are necessary to correctly follow implanted devices over time and perform accurate survival analysis. Hospital Discharge Data is the largest source of information on joint replacement surgery in Italy; however, it does not include the operated side variable, making follow-up impossible and survival estimates unreliable. This work provides a Bayesian Probabilistic Record Linkage model that allows to link, with good accuracy, primary interventions and corresponding revisions (due to implant failure); this makes follow-up possible and precise enough to perform survival analysis with results close to those that can be obtained when the operated side is known
Valorizzare il patrimonio del Registro Italiano ArtroProtesi (RIAP): un passo necessario per migliorare la qualità delle cure e la sicurezza del paziente
Full text linkNel 2020 il Registro Italiano ArtroProtesi (RIAP) ha compiuto 10 anni dalla sua fondazione presso
l’Istituto Superiore di Sanità (ISS). Il numero degli interventi di artroprotesi in Italia cresce ogni anno mediamente
del 4,2%. Istituito con la finalità di tutelare la sicurezza del paziente protesizzato e migliorare la qualità delle cure,
il RIAP ha oggi tutti i prerequisiti per essere pienamente operativo e rispondere a quanto previsto dalle norme
nazionali ed europee. Con la pubblicazione del Regolamento previsto dal DPCM del 3 marzo 2017 ne sarà stabilito
l’iter di adesione. L’infrastruttura è pronta ed è cruciale l’attiva partecipazione di tutte le Regioni.(Enhancing the achievements of the Italian Arthroplasty Registry: a necessary step to improve the quality of
care and patient safety) - In 2020 the Italian Arthroplasty Registry (RIAP) celebrates 10 years since its foundation at the
Italian National Institute of Health (ISS). The number of arthroplasty operations in Italy grows by an average of 4.2%
per year. Established with the aim of improving the quality of orthopaedic care and the patients’ safety, today the RIAP
has all the prerequisites to be fully operational and comply with the national and European standards. The Regulation
(provided for in the Prime Ministerial Decree of March 3, 2017), to be issued soon, will establish the Registry procedures
access. The infrastructure is ready, and the active participation of all regions is now crucial
Hidden Markov Model estimation via Particle Gibbs
No full textQuando la verosimiglianza non ́e trattabile analiticamente, allora le
teniche Markov Chain Monte Carlo standard possono risultare inattuabili. Questo
articolo ha l’obiettivo di analizzare una combinazione di tecniche Sequential Monte
Carlo e dell’algorithmo Metropolis Hastings alla luce dell’approccio pseudomarginale.
Tale combinazione produce algoritmi Particle MCMC, parte di una
classe molto flessibile nota come Exact-Approximate MCMC, che costituiscono un
nuovo paradigma per la stima nell’ambito di Hidden Markov Model non lineari
e non Gaussiani. In questo articolo ́e proposto l’utilizzo del Particle Gibbs per la
stima di un modello HMM applicato alla serie annuale dei terremoti di magnitudo
7 o superiore avvenuti su scala mondiale durante il XXI secolo.When the likelihood of the model is not explicitly available, standard
Markov Chain Monte Carlo techniques may become impractical. This paper has
the aim to investigate a combination of Sequential Monte Carlo and Metropolis-
Hastings algorithm in the spirit of the pseudo-marginal approach. This produces
algorithms known as Particle MCMC which are part of a powerful and flexible class
of algorithms called Exact-Approximate MCMC. They establish a new paradigm
in parameter estimation in the non-linear and non-Gaussian Hidden Markov Models
(HMM). In this paper, the Particle Gibbs sampler is used to recover the parameter of
an HMM applied to the time series of worldwide annual earthquakes of magnitude
7 or greater occurred in the 21st century
Is the treatment of ankle osteoarthritis changing over time in Italy? Analysis of temporal trends for fusion and arthroplasty in a population-based study from 2001 to 2022 on the National Hospital Discharge Record database
Full text linkBackgroundTreatment of ankle osteoarthritis by total ankle replacement (TAR) is increasing worldwide. The aim of the study was to present the overall temporal trends of TAR throughout 22 years (2001-2022) in Italy, analyzing the distributions of hospitals by volume of activity and patients by age and sex, drawing on the National Hospital Discharge Record database. Furthermore, as a secondary aim, we compared these trends with those of ankle fusions. Materials and methodsInternational Classification of Diseases, 9th Revision, Clinical Modification (ICD9-CM) codes of interest were identified to browse the Italian National Hospital Discharge Record database. Surgical volumes, trends over time, classes of hospital activity volume, sex and age of patients, and population incidence rates were described. The statistical significance of time series trends was assessed by the Cox-Stuart test with randomness as a null hypothesis. Results20,248 ankle procedures (total ankle replacements 8853 and ankle fusions 11,395) were extracted from 231,601,523 admissions registered nationally from 2001 to 2022. The yearly total number of TARs significantly increased almost tenfold from 96 to 996 (p < 0.05), while the number of fusions exhibited a stationary behavior (p > 0.05). The increased trend in TAR procedures was concentrated mostly in the North of Italy, with predominantly males between 55 and 64 years of age. The analysis of the number of procedures performed on inhabitants by region and that performed by all the hospitals in the region showed a different pattern across Italy. ConclusionsThe substantial increase in TARs may be owing to improved implant designs and innovative surgical technologies, which allow the treatment of more severe cases and deformities, previously untreated or treated by a fusion. This trend highlights the need to invest in implementing high quality registries by promoting surgeons' participation in data collection.Level of evidence: population based study, level 1 evidence. ConclusionsThe substantial increase in TARs may be owing to improved implant designs and innovative surgical technologies, which allow the treatment of more severe cases and deformities, previously untreated or treated by a fusion. This trend highlights the need to invest in implementing high quality registries by promoting surgeons' participation in data collection.Level of evidence: population based study, level 1 evidence
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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