1,721,159 research outputs found
A reduced questionnaire to investigate the Mediterranean diet in epidemiologic studies
No full textWe evaluated the performance of two reduced dietary questionnaires (RDQ). They were derived from a more complex questionnaire used to investigate the relation between diet and gastric cancer in a case-control study recently concluded in Italy. The full dietary questionnaire (FDQ) used in that study included 181 questions on the frequency/portion size of consumption of 146 different foods and drinks. Two different RDQs were defined, including subgroups of the original food items able to reproduce at least 90% (RDQ90) or 75% (RDQ75), respectively, of the total variability captured by the FDQ on the nutrient intake of controls. Each RDQ provided estimates of nutrients highly correlated with the estimates produced by the FDQ. For different quintiles of nutrient intake, we compared the estimated relative risk obtained by means of the RDQs and the FDQ. For various nutrients, the differences in relative risks were relatively minor, below 20%, but were larger for protein and beta-carotene. These analyses indicate that a RDQ is able to quantify adequately various aspects of the Italian diet for the purpose of epidemiologic inference
Reduced dietary questionnaires in case-control studies: some methodological aspects
No full textIn epidemiological studies on dietary habits (case-control or cohort studies), usually the goal is not to quantify the absolute nutrients intake for each individual, but to rank the subjects according to the level of consumption of the nutrients. For this reason, dietary questionnaires with a limited number of questions, but neverthless able to reproduce the inter-individual variability of intake for some specific nutrients, should be developed. The goal is to define short questionnaires providing estimates of consumprion highly correlated to the true intake. We present a procedure developted to obtain a reduced dietary questionnaire (RDQ) from a more complex questionnaire already used for investigating the Italian diet
Dietary patterns, nutrient intake and gastric cancer in a high-risk area of Italy
No full textTo better understand the role of overall dietary patterns and major energy-providing components in gastric cancer etiology
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
Metastasi di carcinoma non midollare della tiroide in corso di paratiroidectomia per iperparatiroidismo secondario.Problemi chirurgici.
No full textReproducibility of estimated nutrients intake collected by means of a dietary questionnaire
No full textA food frequency questionnaire including 181 questions on 146 different foods and drinks was used in a multicentre case-control study on diet and gastric cancer recently carried out in Italy. A reduced set of questions (75), able to quantify at least 95% of the overall inter-individual variability of consumption of 11 nutrients, including calories, proteins, fats and carbohydrates, was determined using the data collected from 1623 population controls. For each nutrient, RRs estimates with the reduced set of nformation were similar to those obtained by means of the full questionnaire in the original study. 106 subjects (59 males and 47 females) were then randomly selected from the 661 controls recriuted in the centre of Florence and re-interviewed using the full questionnaire. The analysis suggests that a similar reproducibility for several nutrients can be obtained using a reduced questionnaire
A serologic survey of Helicobacter pylori infection in 3281 Italian patients endoscoped for upper gastrintestinal symptoms
No full textVariations 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
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