Lopes Sílvia Costa, Santos Tiago S, Lopes Pedro Faria, Fernandez-Llimos Fernando
Research Institute for Medicine and Pharmaceutical Sciences, Departamento de Sócio-Farmácia da Faculdade de Farmácia da Universidade de Lisboa e ISCTE-IUL, Instituto Universitário de Lisboa e ADETTI-IUL, Portugal.
Rev Port Cir Cardiotorac Vasc. 2012 Jul-Sep;19(3):119-25.
Bibliographic references of scientific articles are the source for calculating impact indexes frequently used for the assignment of funding to research projects. Different citation patterns may result in measurement bias of these impact indexes.
To analyze citation patterns of Brazilian and Portuguese biomedical journals regarding the geographic origin of the sources cited.
As part of the v+biomed project, a convenience sample of 11 biomedical journals, 4 Portuguese and 7 Brazilian, was gathered including the following subject categories: General and Internal Medicine, Public Health, Gynecology and Obstetrics, and Surgery. All the references from all the articles published in all the issues (except supplements) in 2009 and 2010 were retrieved. The type of source cited and its geographic origin were analyzed.
A total of 102 issues from the 11 journals, containing 1430 articles, with a total of 32782 references were analyzed. No differences were found regarding the number of authors, pages or references between articles from Brazilian and Portuguese journals. Brazilian journals presented higher prevalence of English language and cited significantly more journals from their own country (30.1%) comparing to Portuguese journals (5.4%). Additionally, a lower citation rate to journals from the other country analyzed was evident in Brazilian (0.1%) when compared to Portuguese (3.2%) journals, as well as a higher self-citation of Brazilian journals (Brazil - 5.6%, Portugal - 2.1%).
A different citation pattern between Portuguese and Brazilian biomedical journals was found, consisting of a higher citation rate from Brazilian to other Brazilian journals and to themselves. This differential in citation patterns may have implications on impact indexes determination which warrant further investigation.
科学文章的参考文献是计算影响指数的来源，这些影响指数常用于为研究项目分配资金。不同的引用模式可能导致这些影响指数的测量偏差。
分析巴西和葡萄牙生物医学期刊关于所引用文献地理来源的引用模式。
作为v +生物医学项目的一部分，收集了11种生物医学期刊的便利样本，其中4种是葡萄牙的，7种是巴西的，包括以下主题类别：普通内科和内科、公共卫生、妇产科和外科。检索了2009年和2010年所有期刊（增刊除外）上发表的所有文章的所有参考文献。分析了所引用文献的类型及其地理来源。
共分析了11种期刊的102期，包含1430篇文章，共有32782条参考文献。巴西和葡萄牙期刊的文章在作者数量、页数或参考文献数量方面未发现差异。巴西期刊中英语文献的比例更高，并且与葡萄牙期刊（5.4%）相比，引用本国期刊的比例显著更高（30.1%）。此外，与葡萄牙期刊（3.2%）相比，巴西期刊（0.1%）对另一个被分析国家期刊的引用率更低，并且巴西期刊的自引率更高（巴西 - 5.6%，葡萄牙 - 2.1%）。
发现葡萄牙和巴西生物医学期刊之间存在不同的引用模式，即巴西期刊对其他巴西期刊以及自身的引用率更高。这种引用模式的差异可能对影响指数的确定产生影响，值得进一步研究。
