1 Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada.
AJR Am J Roentgenol. 2015 May;204(5):W573-8. doi: 10.2214/AJR.14.13461.
The purpose of this study is to evaluate the rate of duplicate publication in radiology journals. The secondary objective is to evaluate the sensitivity of iThenticate.
From January 1993 to December 2013, Déjà Vu (a database of highly similar citations) and PubMed were used to search for similar citations in 53 radiology journals. Citations were screened independently by two reviewers and verified by a third using predefined criteria to determine true cases of duplicate publication. The overall rate of duplicate publication was calculated; analysis of rate by journal, impact factor, and publication year was performed. The sensitivity of iThenticate was evaluated by analyzing all identified duplicate publications.
From 128,818 citations in the included journals, 1786 (Déjà Vu) and 104 (PubMed) were flagged as potential duplicates. Of these, 248 (226 from Déjà Vu and 22 from PubMed) were classified as true duplicate publications after application of our criteria. The overall rate was 1.92/1000 citations; it varied widely across journals from zero to over 10/1000 citations, showed no correlation with impact factor (R(2) = 0.06; p = 0.093), and no change over time (R(2) = 0.28; p = 0.515). iThenticate flagged 153 of 248 (61.9%) duplicates as "possible duplicates" (defined as overall percentage match > 30%) and identified the corresponding duplicate citation pair in 140 of 248 (56.7%) cases; in 98 of these, the duplicate citation pair was the highest percentage similarity match.
Duplicate publications in radiology journals are uncommon. The rate varies widely between journals, but was not associated with journal impact factor and did not change over time. iThenticate shows promise for identification of duplicate publications; however, refinements may be necessary to maximize its effectiveness.
本研究旨在评估放射学期刊的重复发表率。次要目的是评估 iThenticate 的灵敏度。
从 1993 年 1 月至 2013 年 12 月，使用 Déjà Vu（高度相似引文数据库）和 PubMed 在 53 种放射学期刊中搜索相似引文。引文由两名评审员独立筛选，并由第三名评审员使用预定义标准进行验证，以确定重复发表的真实案例。计算了重复发表的总体率；并按期刊、影响因子和发表年份进行了分析。通过分析所有确定的重复出版物来评估 iThenticate 的灵敏度。
在所纳入的期刊中，从 128818 条引文中，Déjà Vu 标记出 1786 条（PubMed 标记出 104 条）为潜在重复。在应用我们的标准后，其中 248 条（226 条来自 Déjà Vu，22 条来自 PubMed）被归类为真实重复出版物。总体率为 1.92/1000 条；在期刊之间差异很大，从 0 到超过 10/1000 条不等，与影响因子无相关性（R²=0.06；p=0.093），且随时间变化无变化（R²=0.28；p=0.515）。iThenticate 将 248 个重复中的 153 个（61.9%）标记为“可能重复”（定义为总体百分比匹配>30%），并在 248 个重复中的 140 个（56.7%）案例中识别出相应的重复引文对；在这 98 个案例中，重复引文对是最高百分比相似匹配。
放射学期刊的重复发表并不常见。在期刊之间差异很大，但与期刊影响因子无关，且随时间变化无变化。iThenticate 显示出识别重复出版物的潜力；然而，可能需要进行改进以最大限度地提高其效果。
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