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​​​Citations and Impact Factor

Below, we provide data on metrics used by Obstetrics & Gynecology as well as tools for readers available on our website.


In June of each year, several metrics using citation data are released to publishers and scientific journals. One well-known metric is the impact factor, which is "a measure of the frequency with which the 'average article' in a journal has been cited in a particular year or period."1

Obstetrics & Gynecology's 2018 impact factor is 4.965. The journal's ranking is the seventh highest impact factor out of all 83 obstetrics and gynecology journals. Five-year history is available in the Table.

 Year Impact Factor Ranking
​  4.965
​7th of 83 journals
​2017  4.982​​5th of 82 journals
2016  5.2153rd of 80 journals
2nd of 80 journals
2nd of 79 journals

The 5-year impact factor is the average number of times articles from the journal published in the past 5 years have been cited in a particular year.2 Obstetrics & Gynecology’s 2016 5-year impact factor is 5.871 (2018 data to come).

The immediacy index is the average number of times an article is cited in the year it is published.2 Obstetrics & Gynecology’s 2016 immediacy index is 1.343 (2018 data to come).

The Eigenfactor score is a calculation based on the number of times articles from the journal published in the past five years have been cited in [a particular] year, but it also considers which journals have contributed these citations so that highly cited journals will influence the network more than lesser cited journals. References from one article in a journal to another article from the same journal are removed, so that Eigenfactor Scores are not influenced by journal self-citation.2 Obstetrics & Gynecology’s 2018 Eigenfactor score is 0.051050.

For more information on the impact factor, see Benner RS. Evaluating the importance of a journal: the impact factor and other metrics. Obstet Gynecol 2012;119:3–4.

Website Tools

The Obstetrics & Gynecology website features tools that will make tracking important research easy:

  1. Alert Me When Cited allows registered users to receive an email alert every time an article is cited by another article. To take advantage of this feature, simply look in the “Article Tools” box on the right side of the screen when viewing an article at
  2. Cited By is a list of articles that have cited a given article, and can be found at the end of the full-text HTML version of an article, following its reference list. Hyperlinks in the Cited By list enable you to link out to PubMed and locate the article on the web via CrossRef functionality.
  3. Highest Impact articles are identified at in addition to the most viewed and most emailed articles. A special filter is employed to detect articles with rapid citation activity (articles that have been cited more quickly than the average article). The result is a list of what are often key papers in the field.


  1. Clarivate Analytics. The Thomson Reuters Impact Factor. Available at: Retrieved June 20, 2017.
  2. Thomson Reuters. InCites Help. Glossary. Available at: Retrieved June 20, 2017.