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MEDLINE®: Number of Citations to English Language Articles; Number of Citations Containing Abstracts1
(as of mid - December 2016)*

Years of Publication     Total # Records    # English (%)    # Non-English (%)    # with Abstracts (%)2
2015-2016 * 1,022,614 966,285 ( 94% ) 56,329 ( 6% ) 863,022 ( 84% )
2010-2014 4,033,243 3,752,353 ( 93% ) 280,890 ( 7% ) 3,414,920 ( 85% )
2005-2009 3,296,658 2,981,714 ( 90% ) 314,944 ( 10% ) 2,726,440 ( 83% )
2000-2004 2,641,522 2,356,084 ( 89% ) 285,438 ( 11% ) 2,079,224 ( 79% )
1995-1999 2,177,209 1,908,930 ( 88% ) 268,279 ( 12% ) 1,638,980 ( 75% )
1990-1994 1,974,307 1,652,193 ( 84% ) 322,114 ( 16% ) 1,438,841 ( 73% )
1985-1989 1,743,614 1,349,620 ( 77% ) 393,994 ( 23% ) 1,067,729 ( 61% )
1980-1984 1,439,231 1,069,031 ( 74% ) 370,200 ( 26% ) 724,389 ( 50% )
1975-1979 1,288,905 894,364 ( 69% ) 394,541 ( 31% ) 533,461 ( 41% )
1970-1974 1,107,890 694,236 ( 63% ) 413,654 ( 37% ) 40,423 ( 4% )
1965-1969 949,617 518,640 ( 55% ) 430,977 ( 45% ) 20,484 ( 2% )
1960-1964** 645,227 314,602 ( 49% ) 330,625 ( 51% ) 8,333 ( 1% )
1955-1959** 537,247 253,109 ( 47% ) 284,138 ( 53% ) 2,956 ( 1% )
1950-1954** 505,214 230,278 ( 46% ) 274,936 ( 54% ) 1,526 ( .30% )
pre-1950** 259,177 166,944 ( 64% ) 92,233 ( 36% ) 634 ( .24% )
Totals***     23,621,675     19,108,383 ( 81% )     4,513,292 ( 19% )     14,561,362 ( 62% )

1Includes author abstracts (in AB field), or abstracts written by someone other than the author or an indication that the author abstract is available in other languages (the latter two are in OAB, Other Abstract field).

2Structured Abstracts: approximately 30% of abstracts added in recent years are structured abstracts.

*Derived from the 2017 MEDLINE/PubMed Baseline produced in mid-December 2016.

** 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 PubMed status or "as supplied by publisher" status. As of the 2016 MEDLINE/PubMed baseline, all OLDMEDLINE subset citations were converted to MEDLINE status because every such citation was mapped to at least one current MeSH heading. In the future when NLM adds more OLDMEDLINE citations, there may be a period of time when the citations status equals OLDMEDLINE until NLM can map to current MeSH

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 the out-of-scope completed citations use: pubmednotmedline [sb]
    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.