Sorrentino D, De Biase F, Trevisi A, Bartoli E
Gastrointestinal Unit-Internal Medicine, Department of Clinical and Experimental Pathology, University of Udine, Italy.
Digestion. 2000;61(2):77-83. doi: 10.1159/000007738.
To evaluate number and quality of publications in gastroenterology, hepatology and digestive endoscopy from Western Europe (Belgium, Denmark, France, Germany, Great Britain, Italy, the Netherlands, Spain, Sweden, Switzerland), Japan and USA over a recent 5-year period.
We screened by computer for full liver/gastrointestinal-related articles and reviews the top 40% of journals (according to the annual rating of the SCI Journal Citation Reports; Institute for Scientific Information database) in most clinical and basic science disciplines in the years 1992-1996. To be credited with an article, a given country had to be the site of the first institution where the work was conducted. Papers were rated according to the impact factor of the Institute for Scientific Information and to the ratio impact factor/mean European impact factor. Data were also normalized for nondefense research and development expenditure.
As randomly tested, the computer search had an error of +/- 5-10%. In Europe, Great Britain achieved the highest total impact factor and the highest number of papers. Most of the British impact factor came from publications in British journals. The total USA impact factor exceeded that of Europe by 20%. The average impact factor for a single paper was highest for the USA and, in Europe, for Germany. The temporal trend of total impact factor showed Spain improving by 9% per year, with Germany and Italy also displaying a substantial growth. Expressed per funds allocated in nondefense research and development, Great Britain and the USA had the highest cumulative impact factor.
评估西欧（比利时、丹麦、法国、德国、英国、意大利、荷兰、西班牙、瑞典、瑞士）、日本和美国在最近5年里胃肠病学、肝病学及消化内镜领域的出版物数量和质量。
我们通过计算机筛选1992 - 1996年期间大多数临床和基础科学学科中排名前40%的期刊（根据科学信息研究所期刊引用报告的年度评级；科学信息数据库）中所有与肝脏/胃肠道相关的文章和综述。一篇文章若要记在某个国家名下，该国必须是开展此项研究的首个机构所在的地点。论文根据科学信息研究所的影响因子以及影响因子/欧洲平均影响因子的比值进行评分。数据也根据非国防研发支出进行了归一化处理。
经随机测试，计算机搜索的误差为±5 - 10%。在欧洲，英国的总影响因子最高，论文数量也最多。英国的大部分影响因子来自在英国期刊上发表的文章。美国的总影响因子比欧洲高出20%。单篇论文的平均影响因子美国最高，在欧洲则是德国最高。总影响因子的时间趋势显示西班牙每年提高9%，德国和意大利也有显著增长。按非国防研发投入的资金计算，英国和美国的累积影响因子最高。
