Skip Navigation Bar

2015 MEDLINE®/PubMed® Baseline: 23,343,329 Citations Found

Element Name Citations Occurrences Min/Avg/Max
Occurrences
Min/Avg/Max
Length
PMID 23,343,329 23,343,329 1/1.00/1 1/7.53/8
DateCreated 23,343,329 23,343,329 1/1.00/1 8/8.00/8
DateCompleted 23,343,329 23,343,329 1/1.00/1 0/0.00/0
DateRevised 0 0 0/0.00/0 0/0.00/0
ISSN 22,969,853 22,969,853 0/1.00/1 9/9.00/9
IssnType=Electronic   4,457,325    
IssnType=Print   18,512,528    
Volume 22,949,373 22,949,373 0/1.00/1 1/2.22/50
Issue 21,213,747 21,213,747 0/1.00/1 1/1.45/60
PubDate 23,343,329 23,343,329 1/1.00/1 4/7.32/38
Title 23,343,329 23,343,329 1/1.00/1 2/37.24/585
ISOAbbreviation 23,342,892 23,342,892 0/1.00/1 1/16.53/96
ArticleTitle 23,343,329 23,343,329 1/1.00/1 2/86.09/1999
MedlinePgn 23,319,617 23,319,617 0/1.00/1 1/5.68/173
ELocationID 4,448,522 4,796,354 0/1.08/2 0/0.00/0
Valid Yes   4,796,354    
Valid No   0    
EIdType=doi   4,412,326    
EIdType=pii   384,028    
Abstract        
AbstractText 14,026,022 14,026,022 0/1.00/1 24/1226.65/9996
CopyrightInformation 1,290,771 1,290,771 0/1.00/1 1/54.23/554
Identified as Structured Abstract 2,579,239      
AbstractText 2,579,239 10,912,243 1/4.23/22  
NLMCategory: UNLABELLED 68,545 68,545    
NLMCategory: BACKGROUND 1,118,121 1,138,638    
NLMCategory: OBJECTIVE 1,702,987 1,707,880    
NLMCategory: METHODS 2,340,939 2,949,273    
NLMCategory: RESULTS 2,425,824 2,430,600    
NLMCategory: CONCLUSIONS 2,533,762 2,603,685    
NLMCategory: UNASSIGNED 10,961 13,622    
Author 22,853,415 82,695,798 0/3.62/3173 1/12.29/489
Valid Yes   82,678,646    
Valid No   17,152    
LastName 22,826,935 82,556,338 0/3.62/3172 1/6.74/129
ForeName 22,797,927 82,464,750 0/3.62/3172 1/4.08/111
Initials 22,797,927 82,464,749 0/3.62/3172 1/1.42/8
Suffix 403,372 425,960 0/1.06/7 2/2.20/3
CollectiveName 127,613 139,460 0/1.09/29 1/41.89/489
LastForeSuffix 22,826,935 82,556,338 0/3.62/3172 1/10.83/130
LastInitialsSuffix 22,826,935 82,556,338 0/3.62/3172 1/8.17/130
Affiliation 13,159,142 14,124,852 0/1.07/2937 1/106.17/2000
Identifier 4,059 7,000 0/1.72/18 16/20.76/51
Language 23,343,329 23,392,193 1/1.00/6 3/3.00/3
Grant 2,145,935 5,254,533 0/2.45/357 14/38.18/110
GrantID 2,066,734 5,111,433 0/2.47/357 1/10.58/66
Acronym 1,912,791 4,801,869 0/2.51/357 2/2.00/2
Agency 2,145,935 5,254,533 0/2.45/357 2/13.09/84
Country 2,145,935 5,254,533 0/2.45/357 5/12.97/14
PublicationType 23,343,329 41,589,473 1/1.78/10 4/18.17/56


Element Name Citations Occurrences Min/Avg/Max
Occurrences
Min/Avg/Max
Length
DataBank 254,570 258,708 0/1.02/4 5/111.45/47047
DataBankName 254,570 258,708 0/1.02/4 3/7.53/18
AccessionNumber 254,570 3,441,161 0/13.52/5880 2/7.81/20
ArticleDate 3,767,594 3,767,594 0/1.00/1 8/8.00/8
VernacularTitle 3,472,592 3,472,592 0/1.00/1 1/77.83/611
Country 23,343,329 23,343,329 1/1.00/1 4/10.14/35
MedlineTA 23,343,329 23,343,329 1/1.00/1 1/15.46/96
NlmUniqueID 23,343,329 23,343,329 1/1.00/1 7/7.29/9
ISSNLinking 22,752,972 22,752,972 0/1.00/1 9/9.00/9
Chemical 11,648,042 44,184,266 0/3.79/58 4/21.15/250
RegistryNumber 11,648,042 44,184,266 0/3.79/58 1/4.70/15
NameOfSubstance 11,648,042 44,184,266 0/3.79/58 2/16.45/249
SupplMeshName 48,790 54,515 0/1.12/10 5/22.30/177
Type=Disease 30,902 32,221 0/1.04/5 5/28.41/177
Type=Protocol 17,928 22,294 0/1.24/10 5/13.47/43
CitationSubset 21,959,504 25,007,997 0/1.14/6 1/1.99/3
GeneSymbol 59,508 126,194 0/2.12/25 1/4.51/41
CommentsCorrections 3,197,949 65,154,578 0/20.37/4916 8/45.56/827
RetractionOf 3,240 3,528 0/1.09/20 25/94.87/344
RetractionIn 3,352 3,383 0/1.01/2 27/58.02/341
SummaryForPatientsIn 1,121 1,135 0/1.01/3 29/45.74/72
OriginalReportIn 1,089 1,135 0/1.04/3 32/48.04/68
CommentOn 582,747 650,133 0/1.12/34 8/45.67/227
CommentIn 521,105 659,904 0/1.27/57 24/47.78/125
ErratumIn 131,232 133,479 0/1.02/10 9/44.06/827
ErratumFor 1,163 1,188 0/1.02/7 8/46.08/104
ReprintIn 2,363 2,400 0/1.02/4 27/49.92/111
ReprintOf 2,261 2,271 0/1.00/4 26/49.22/211
RepublishedFrom 1,441 1,446 0/1.00/2 19/45.45/110
RepublishedIn 1,251 1,256 0/1.00/2 26/47.23/92
UpdateIn 5,050 5,082 0/1.01/2 33/49.91/60
UpdateOf 4,848 4,849 0/1.00/2 31/50.11/100
PartialRetractionOf 36 37 0/1.03/2 32/115.51/211
PartialRetractionIn 36 36 0/1.00/1 36/81.44/199
Cites 2,138,171 63,683,316 0/29.78/4916 22/45.53/198
MeshHeading 21,850,751 221,985,614 0/10.16/103 2/20.26/204
DescriptorName 21,850,751 221,985,614 0/10.16/103 2/14.09/104
Descriptor Major 11,384,724 21,038,574 0/1.85/103 0
Descriptor Not Major 20,580,656 197,236,029 0/9.58/63 0
QualifierName 19,432,254 122,303,677 0/6.29/71 5/11.21/29
Qualifier Major 18,636,573 53,329,623 0/2.86/52 0
Qualifier Not Major 15,183,959 68,974,054 0/4.54/71 0
Descriptor and/or Qualifier Major 21,714,929 71,693,111 0/3.30/103 0
PersonalNameSubject 167,896 190,614 0/1.14/28 3/12.57/75
LastName 167,896 190,614 0/1.14/28 1/7.36/69
ForeName 162,358 183,590 0/1.13/28 1/3.98/48
Initials 162,358 183,590 0/1.13/28 1/1.42/6
Suffix 1,270 1,306 0/1.03/3 1/2.20/12
LastForeSuffix 167,896 190,614 0/1.14/28 3/11.20/73
LastInitialsSuffix 167,896 190,614 0/1.14/28 2/8.74/69


Element Name Citations Occurrences Min/Avg/Max
Occurrences
Min/Avg/Max
Length
NumberOfReferences 1,546,235 1,546,235 0/1.00/1 1/2.10/8
OtherID 3,951,961 4,470,586 0/1.13/6 1/11.14/391
NLM Source   2,914,623    
OtherAbstract        
AbstractText 67,000 67,561 0/1.01/5 38/1179.23/4096
CopyrightInformation 1,855 1,855 0/1.00/1 11/16.80/17
Keyword 2,606,909 9,100,818 0/3.49/245 1/16.49/259
Keyword Major 2,073,235 5,491,086 0/2.65/105  
Keyword Not Major 613,258 3,609,732 0/5.89/245  
GeneralNote 149,585 282,999 0/1.89/32 2/34.27/1226
SpaceFlightMission 4,188 19,395 0/4.63/12 6/13.87/28
InvestigatorList 33,695      
Investigator: Inclusive (pre-2008 Policy) 8,936 10,291 0/1.15/6 7/31.05/96
LastName 8,936 10,291 0/1.15/6 2/6.69/16
ForeName 8,928 10,280 0/1.15/6 1/2.70/9
Initials 8,928 10,280 0/1.15/6 1/1.85/2
Suffix 16 16 0/1.00/1 2/2.19/3
Affiliation 8,935 10,290 0/1.15/6 3/19.81/83
LastForeSuffix 8,936 10,291 0/1.15/6 3/9.40/19
LastInitialsSuffix 8,936 10,291 0/1.15/6 3/8.54/18
Investigator: 2008 Policy 24,759 1,527,907 0/61.71/3741 2/12.54/164
LastName 24,759 1,527,907 0/61.71/3741 1/7.01/158
ForeName 24,689 1,515,724 0/61.39/3740 1/4.39/46
Initials 24,689 1,515,724 0/61.39/3740 1/1.19/6
Suffix 1,826 3,219 0/1.76/20 2/2.30/3
Affiliation 22 22 0/1.00/1 8/23.64/47
LastForeSuffix 24,759 1,527,907 0/61.71/3741 2/11.36/163
LastInitialsSuffix 24,759 1,527,907 0/61.71/3741 2/8.19/159


Element Name Size or Count
Average Record Size in Bytes 1,439
Words in Title Average 11.85
Words in Title Max 341
Words in Abstract Average 185.29
Words in Abstract Max 1,696
AB Size Zero 9,317,307
AB Size < 1,000 4,967,419
AB Size 1,000 - 1,999 8,166,236
AB Size 2,000 - 2,999 844,900
AB Size 3,000 - 3,999 40,983
AB Size 4,000 - 4,999 4,464
AB Size > 5,000 2,020
Number of MH Occurrences with NO SHs 133,865,663
Number of MH Occurrences with ONE SH 61,897,094
Number of MH Occurrences with SHs 88,119,951
Number of MH Type=Geographic 3,711,011


CollectiveName, Author, and Investigator Related Counts
Citations containing ONLY CollectiveName 26,480
Citations containing BOTH CollectiveName and Author LastName 101,133
Citations containing BOTH CollectiveName and Investigator LastName 24,732
Citations containing BOTH Author LastName and Investigator LastName 32,026
Citations containing Investigator LastName and Owned by NASA 3,904
Both Investigator and Author Found 32,026
Investigator Found Without Collective 8,963


MedlineCitation Status Counts
Completed 0
In-Process 0
In-Data-Review 0
PubMed-not-MEDLINE 1,383,825
OLDMEDLINE 265,021
MEDLINE 21,694,483


Article PubModel Counts
Print-Electronic 1,841,436
Electronic-Print 23,421
Print 17,025,617
Electronic-eCollection 72,306
Electronic 256,617


JournalIssue CitedMedium Counts
Internet 4,496,573
Print 18,846,756


Owner MedlineCitation GeneralNote Keyword OtherAbstract
NLM 23,210,973 4,813 1,992,464 0
NASA 10,752 4,570 12,939 409
PIP 37,914 63,798 68,871 53,164
KIE 31,953 209,616 73,817 3,026
HSR 8,061 202 0 0
HMD 43,676 0 0 0
SIS 0 0 0 0
NOTNLM 0 0 459,266 0
AIDS 0 0 0 5,342
Publisher 0 0 0 5,620


Grant Country Occurrences
United States 4,925,065
United Kingdom 270,168
Italy 11,102
Canada 42,561
Austria 3,607
International 2,008
Ireland 22


CitationSubsets Counts
AIM 2,011,553
B 10,445
C 7,545
D 536,836
E 91,770
F 8,016
H 264,467
IM 18,664,377
J 68,959
K 23,787
N 637,017
OM 2,010,956
Q 201,857
QIS 6,989
QO 24,429
R 3,602
S 188,645
T 56,155
X 190,592


Publication Types Counts
Addresses 4,428
Autobiography 2,910
Bibliography 15,176
Biography 165,649
Case Reports 1,696,795
Classical Article 5,845
Clinical Conference 6,561
Clinical Trial 486,416
Clinical Trial, Phase I 14,146
Clinical Trial, Phase II 22,802
Clinical Trial, Phase III 9,034
Clinical Trial, Phase IV 948
Comment 582,747
Comparative Study 1,674,497
Congresses 60,760
Consensus Development Conference 9,093
Consensus Development Conference, NIH 719
Controlled Clinical Trial 88,076
Corrected and Republished Article 1,441
Dictionary 535
Directory 6,618
Duplicate Publication 1,167
Editorial 350,092
English Abstract 1,722,284
Evaluation Studies 196,376
Festschrift 1,465
Government Publications 189
Guideline 15,410
Historical Article 304,427
Interactive Tutorial 218
Publication Types Counts (continued):
Interview 24,886
Introductory Journal Article 30,290
Journal Article 21,846,236
Lectures 5,995
Legal Cases 10,418
Legislation 1,668
Letter 830,540
Meta-Analysis 49,593
Multicenter Study 173,198
News 162,240
Newspaper Article 17,997
Observational Study 5,962
Overall 27,298
Patient Education Handout 4,044
Periodical Index 322
Personal Narratives 1,126
Portraits 39,867
Practice Guideline 19,308
Pragmatic Clinical Trial 73
Published Erratum 1,180
Randomized Controlled Trial 376,368
Research Support, American Recovery and Reinvestment Act 1,424
Research Support, N.I.H., Extramural 745,378
Research Support, N.I.H., Intramural 36,046
Research Support, Non-U.S. Gov't 5,619,349
Research Support, U.S. Gov't, Non-P.H.S. 673,357
Research Support, U.S. Gov't, P.H.S. 1,446,292
Retracted Publication 3,384
Retraction of Publication 3,305
Review 1,901,817
Scientific Integrity Review 190
Technical Report 2,260
Twin Study 6,263
Validation Studies 68,471
Video-Audio Media 6,193
Webcasts 311


ELocationId EIdType Counts
DOI or PII, MedlinePgn Not Found 4,818
DOI or PII, MedlinePgn Found 4,095,872
DOI and PII, MedlinePgn Not Found 18,894
DOI and PII, MedlinePgn Found 328,938


PMID Versioning Counts
Version 1 23,343,051
Version 2 232
Version 3 27
Version 4 7
Version 5 3
Version 6 3
Version 7 2
Version 8 2
Version 9 1
Version 10 1