Objectives: Errors in search strategies negatively affect the quality and validity of systematic reviews. The primary objective of this study was to evaluate searches performed in MEDLINE/PubMed to identify errors and determine their effects on information retrieval.Methods: A PubMed search was conducted using the systematic review filter to identify articles that were published in January of 2018. Systematic reviews or meta-analyses were selected from a systematic search for literature containing reproducible and explicit search strategies in MEDLINE/PubMed. Data were extracted from these studies related to ten types of errors and to the terms and phrases search modes.Results: The study included 137 systematic reviews in which the number of search strategies containing some type of error was very high (92.7%). Errors that affected recall were the most frequent (78.1%), and the most common search errors involved missing terms in both natural language and controlled language and those related to Medical Subject Headings (MeSH) search terms and the non-retrieval of their more specific terms.Conclusions: To improve the quality of searches and avoid errors, it is essential to plan the search strategy carefully, which includes consulting the MeSH database to identify the concepts and choose all appropriate terms, both descriptors and synonyms, and combining search techniques in the free-text and controlled-language fields, truncating the terms appropriately to retrieve all their variants.

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It is assumed that prior probability of AD is 66%,' and that 50% of non-AD dementias are Vdem and 50% are other forms which have apoE allele frequency similar to controls. Data on the largest proportion of our patients and all controls have been published.49

The prevalence of diabetes in Aragón was moderately high (6.1%) and comparable with that reported in other white populations around the world. The proportion of unknown cases of diabetes was nearly 50%. Cardiovascular risk factors associated with diabetes and IGT supported the existence of an insulin resistance or metabolic syndrome, but there were not sufficient differences between diabetes and IGT to suggest a possible pathogenetic relation of hyperinsulinemia and associated risk factors.

Resumen: Este artículo analiza el grado de correlación existente entre diferentes indicadores bibliométricos obtenidos de las revistas indizadas en 2013 enWoS y Scopus. Se han seleccionado los indicadores Factor de Impacto (FI), Factor de Impacto 5 años (FI5), Inmediatez, Eigenfactor Score (ES), Influencia del Artículo (AIS), ScimagoJournal Rank(SJR), citas/documentos en 2 años (FIScopus), índice H, Impacto por Publicación (IPP) e Impacto Normalizado por Artículo (SNIP). El número total de revistas coincidentes en ambas bases de datos fue de 10.700, de las que se seleccionaron para el análisis dela correlación 9.657 que contenían todos los indicadores. Se aplicó el coeficiente de correlación de Spearman mostrando en algunos indicadores valores muy altos, tanto de manera global como en las áreas de ciencias y ciencias sociales, evidenciando validez convergente, lo que plantea si son necesarios distintos indicadores cuando realmente miden lo mismo. Solo el índice H presentólos valores más bajos,ofreciendo información complementaria al resto de indicadores.