1,720,958 research outputs found
Interpreting neonatal hip sonography: intraobserver and interobserver variability.
No full textOBJECTIVES: The purpose of this study is to state the reliability of neonatal hip ultrasound interpretation, defining the intra and interoperator variability in the evaluation of the scans. METHODS: We considered a sample of 2071 scans (coming from 798 patients who attended the screening programme for hip dysplasia), which were interpreted by the operator who obtained and read the images at the screening time and then by a different operator who saw the images for the first time. RESULTS: Both the intra and interoperator variability of α and β angles' values resulted statistically not significative (intraclass correlation coefficient > 0.8) and determining a class shift (according to the Graf's classification) in a nonstatistically significative number of cases (agreement percentage >91% and Cohen's κ >0.8). CONCLUSION: Hip sonography can reliably detect hip dysplasia and the intra and interoperator variability in the interpretation of the exam is NS when the examination is correctly executed
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
Clinical charateristics of adolescent headache.
No full textWe evaluate clinical characteristics of headache in a group of subjects > 12 years to assess the sensitivity and specificity of the IHS criteria. We consider whether age at onset may influence the clinical features. We used a semi-structured questionnaire to examine 136 patients consecutively referred to our division. We considered the following subdiagnoses: IHS 1.1, 1.2, 1.7, 2.1, 2.2, 2.3. Migrainous disorders were found to be more common than non-migrainous headaches. A definite diagnosis was established in 68.1% of the migrainous group and in 86.6% of the tension-type headache group. Unilateral location, severe intensity of pain, the presence of nausea, vomiting, phonophobia and photophobia were features which differed between migrainous and non-migrainous subjects. No difference was found regarding aggravation of the headache by physical activity. On the basis of the criterion duration of attacks < 2 hours, IHS 1.7 was found to differ significantly from other migraine types. With the exception of the presence of vomiting in migrainous patients, the age at onset was not found to be a factor influencing the characteristics of the headache. Diagnostic criteria for migraine were highly specific but poorly sensitive, and those for tension-type headaches highly sensitive but less specific. The sensitivity/specificity of the IHS criteria in adolescent migraine can be influenced by the heterogeneity of the clinical characteristics. In fact, the intensity, the location and the quality of pain were similar to those found in childhood migraine, while the concomitant symptoms were less frequent than in childhood and in adult migraine. Further studies are needed to define the degree of severity of the clinical features in adolescent headache and to address the question of the validity of the IHS criteri
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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