1,720,956 research outputs found
Il controllo delle malattie infettive attraverso l'obbligo o la libera scelta delle vaccinazioni [The control of infectious diseases: obligatory or optional vaccination?]
No full textThe change from obligatory to optional or recommended vaccination seems to be inevitable. With obligatory vaccination more than 90% of children are adequately vaccinated against diphtheria, tetanus, poliomyelitis and hepatitis B. In contrast, with an optional or recommended vaccination strategy, it is difficult to obtain control and eradication. At the present time, polio eradication is about 99% but to achieve total eradication will require a considerable organizational and economic investment. Surveillance of AFP (acute flaccid paralysis) indicates the state of polio eradication. Only by monitoring and prevention can we be sure that there is no circulation of wild poliovirus
Obesity in school-aged children: Interpretation of the Body Mass Index in a sample of children and adolescents in Rome.
No full textOBJECTIVES: To evaluate overweight and obesity in a sample of children of school age in the city of Rome (Italy). MATERIALS AND METHODS: A sample of 18.299 school children (9.531 males and 8.768 females) aged between 3 and 15 years was studied. Height and weight have been measured in order to calculate the BMI. The percentile distribution of BMI has been determined and then subdivided according to the categories proposed by Cole. The analysis has been done using the program "Statistica" produced by StatSoft, Italia. RESULTS: The prevalence of overweight exceeded 20% in all age groups with the exception of the two extremes 3 years old and 15 years old in which the prevalence was 11.8% and 15.4% respectively. Children between 5 and 10 years old have the highest rates of obesity. The prevalence of obesity was highest in females between 4 and 8 years, while for the males it was 8 to 15 years. However the difference in the prevalence between males and females was statistically significantly different only in ages 9 and 10. CONCLUSIONS: The prevalence of overweight rises to a peak at age 9, reaching 30%, but declines at older ages. The prevalence of obesity peaks at an earlier age reaching between 12% and 15% at ages 5-8 years. The prevalence of obesity declines as the children get older
Obesità infantile. Studio epidemiologico longitudinale sui bambini del distretto scolastico di Fara Sabina.
No full text
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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