Key MEDLINE® Indicators
| FY2012 | % Change | FY2011 | % Change | FY2010 | % Change | FY2009 | % Change | FY2008 | % Change | |
|---|---|---|---|---|---|---|---|---|---|---|
|
Citations Indexed for MEDLINE
|
760,903 | +5% | 724,831 | +4% | 699,420 | -1.9% | 712,675 | +6% | 671,904 | +1% |
|
MEDLINE/PubMed® Searches1
|
2.2 Billion | +22% | 1.8 Billion | +13% | 1.6 Billion | +23% | 1.3 Billion | +65% | 776 Million2 | N.A.2 |
|
Sub-Total: Web3
|
932 Million | +6% | 879 Million | +9% | 808 Million | +5% | 767 Million | ---- | ---- | ---- |
|
Sub-Total: API3
|
1.3 Billion | +36% | 956 Million | +24% | 771 Million | +50% | 514 Million | ---- | ---- | ---- |
|
Gateway Searches4
|
---- | ---- | 874,000 | -27% | 1.2 Million | -25% | 1.6 Million | +36% | 1.1 Million5 | +51% |
|
Journal Titles in MEDLINE
|
5,633 | +1% | 5,559 | +1% | 5,484 | +2% | 5,394 | +1% | 5,319 | +2% |
|
Journal Titles in
Index Medicus6 |
5,025 | +2% | 4,946 | +2% | 4,866 | +2% | 4,759 | +2% | 4,660 | +3% |
|
Total Citation Data Creation
|
875,576 | +4% | 845,948 | +10% | 767,470 | +3% | 748,479 | +4% | 720,0975 | +5% |
|
OCRed Citations
|
62,562 | -12% | 71,145 | -8% | 77,309 | -12% | 87,970 | -7% | 94,711 | -11% |
|
Citations Received
Electronically via XML |
813,014 | +5% | 774,803 | +12% | 690,161 | +4.5% | 660,509 | +6% | 625,386 | +8% |
|
Retraction Notices
|
348 | +37% | 2545 | +15%5 | 221 | +0.5% | 220 | +26% | 174 | +47% |
|
Retracted Articles
|
375 | +38% | 2715 | +12% | 243 | -2% | 249 | +40% | 178 | +44% |
|
Partial Retraction Notices7
|
1 | 0% | 1 | -86% | 7 | +40% | 5 | 0% | 5 | -58% |
|
Partially Retracted Articles7
|
1 | 0% | 1 | -86% | 7 | +40% | 5 | 0% | 5 | -62% |
|
Errata
|
8,142 | +4% | 7,870 | -7% | 8,433 | +15% | 7,360 | -5% | 7,756 | +10% |
|
Comments
|
37,158 | +6% | 35,049 | -2% | 35,688 | +6.5% | 33,526 | +1% | 33,238 | +4% |
|
Gene Indexing
|
88,944 | +11% | 80,297 | +0.3% | 80,042 | -3.5% | 82,932 | +12% | 74,252 | +43% |
See also additional MEDLINE statistics.
The U.S. Government Fiscal Year (FY) runs from October 1 - September 30.
Note: See Errata Fact Sheet for definitions. NLM began to report retracted articles separately in FY2003. Prior to that the numbers reported were Retraction Notices only.
Note: See Gene Indexing and Entrez Gene. Gene indexing began to be phased in during 4th Quarter FY2001 (Jul-Sep) with several hundred links. In 2005, gene indexing changed from LocusLink, where 10 organisms were in scope, to Entrez Gene, where more than 1,800 organisms are in scope. In 2007, gene indexing was applied to more clinical genetics articles.
1Statistical gathering method refined in FY2009.
2June 2007 implementation of Entrez 2.0 ("portals") resulted in changes to the statistical gathering process. FY2008 represents a new baseline for the data and cannot be compared to FY2007.
3Sub-Total labels changed for FY2012 from "Web/Interactive" to "Web" and from "Scripts/E-Utilities" to "API" (Application Programming Interface).
4FY2011 is last full reporting year for the original NLM Gateway; it was transitioned to a new pilot project containing two databases in December 2011. See Reminder: NLM Gateway Changing for additional information.
5Corrected from previously reported numbers:
- FY2008 Gateway Searches previously 998 Million
- FY2008 Total Citation Data Creation previously 726,097
- FY2011 Retraction Notices previously 267 and +21%
- FY2011 Retracted Articles previously 273
6 Index Medicus® was a monthly bibliographic listing of current biomedical references derived from MEDLINE. The item remains an online indicator in MEDLINE citations found in PubMed. Index Medicus® ceased in print after December 2004 edition.
7 NLM began to report partial retractions separately in December 2006.
