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MEDLINE®: Number of Citations to English Language Articles; Number of Citations Containing Abstracts1
(as of mid - November 2013)*

Years of Publication Total # Records # English (%) # Non-English (%) # with Abstracts (%)2
2010-2014* 2,617,986 2,438,381 ( 93% ) 179,605 ( 7% ) 2,208,948 ( 84% )
2005-2009 3,288,591 2,977,762 ( 91% ) 310,829 ( 9% ) 2,719,500 ( 83% )
2000-2004 2,639,536 2,355,078 ( 89% ) 284,458 ( 11% ) 2,077,747 ( 79% )
1995-1999 2,176,930 1,908,768 ( 88% ) 268,162 ( 12% ) 1,638,768 ( 75% )
1990-1994 1,974,253 1,652,142 ( 84% ) 322,111 ( 16% ) 1,438,814 ( 73% )
1985-1989 1,743,575 1,349,585 ( 77% ) 393,990 ( 23% ) 1,067,696 ( 61% )
1980-1984 1,439,095 1,069,013 ( 74% ) 370,082 ( 26% ) 724,308 ( 50% )
1975-1979 1,288,830 894,291 ( 69% ) 394,539 ( 31% ) 533,414 ( 41% )
1970-1974 1,107,927 694,176 ( 63% ) 413,751 ( 37% ) 40,392 ( 4% )
1965**-1969 948,059 517,385 ( 55% ) 430,674 ( 45% ) 20,389 ( 2% )
1960-1964** 599,107 291,148 ( 49% ) 307,959 ( 51% ) 7,934 ( 1% )
1955-1959** 406,695 193,397 ( 48% ) 213,298 ( 52% ) 2,177 ( 1% )
1950-1954** 420,366 193,591 ( 46% ) 226,775 ( 54% ) 1,256 ( <1% )
pre-1950** 134,671 84,469 ( 63% ) 50,202 ( 37% ) 345 ( <1% )
Totals 20,785,621 16,619,186 ( 80% ) 4,166,435 ( 20% ) 12,481,688 ( 60% )

1Includes author abstracts (in AB field) or abstracts written by someone other than the author (in OAB, Other Abstract field).

2Structured Abstracts: about 25%-30% of abstracts added in recent years are structured abstracts.

*Derived from the 2014 MEDLINE/PubMed Baseline produced in mid-November 2013. At that time, publication year 2013 was not complete and publication year 2014 had only 98 citations. Prior to this 2014 update, the statistics for this page were derived from PubMed searches. Going forward, we will continue to derive these statistics from the MEDLINE/PubMed baselines produced annually in November. Compared to the 2013 statistics, there is a small decrease in the Number of Records counts for two reasons: a. using baseline data rather than PubMed searches (see also Note 1 below), and b. identifying and deleting duplicate citations in March 2013 (which mostly affected the counts prior to 1990).

**As of December 2006, OLDMEDLINE subset citations that have all of their original subject terms mapped to current MeSH are included in MEDLINE. There are more citations in PubMed with these older publication dates; some are OLDMEDLINE status, but some are PubMed status or "as supplied by publisher" status.

Notes:

  1. Typically a PubMed search will yield higher numbers, as NLM may have processed more completed citations since the baseline was produced for various reasons, e.g., time lag in receipt, or a new journal for indexing going back to volume 1, or data from back issues such as those deposited in PubMed Central, or from other sources. Also, PubMed includes both the print and electronic publication dates in a publication date search. Therefore, citations to articles published electronically and in print with 2 different publication dates will be retrieved in 2 different [dp] searches, thereby getting counted twice. For example, a paper published electronically in December 2013 and in print in January 2014 will be counted once in a 2013 [dp] search and again in a 2014 [dp] search.
  2. Counts are limited to the MEDLINE subset [sb] of PubMed and do not include out-of-scope citations. To search PubMed for MEDLINE excluding OLDMEDLINE subset citations, add NOT jsubsetom to your search; for example: 1965 [dp] AND medline [sb] NOT jsubsetom.
  3. NLM began to include abstracts routinely in online citations in 1975. Abstracts in earlier years largely come from NLM collaborating partners and some projects to load data from back issues (such as from PubMed Central and other sources). When adding missing citations (gaps) in the OLDMEDLINE range of years (pre-1966), abstracts, if present in the original article, are now included.