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2015 MEDLINE/PubMed Baseline Excluding OLDMEDLINE Data: 21,332,373 Citations Found

Element Name Citations Occurrences Min/Avg/Max
Occurrences
Min/Avg/Max
Length
PMID 21,332,373 21,332,373 1/1.00/1 1/7.49/8
DateCreated 21,332,373 21,332,373 1/1.00/1 8/8.00/8
DateCompleted 21,332,373 21,332,373 1/1.00/1 0/0.00/0
DateRevised 0 0 0/0.00/0 0/0.00/0
ISSN 21,141,404 21,141,404 0/1.00/1 9/9.00/9
IssnType=Electronic   4,452,960    
IssnType=Print   16,688,444    
Volume 20,949,911 20,949,911 0/1.00/1 1/2.24/50
Issue 20,032,052 20,032,052 0/1.00/1 1/1.44/60
PubDate 21,332,373 21,332,373 1/1.00/1 4/7.30/38
Title 21,332,373 21,332,373 1/1.00/1 2/37.40/585
ISOAbbreviation 21,331,941 21,331,941 0/1.00/1 1/16.52/96
ArticleTitle 21,332,373 21,332,373 1/1.00/1 2/88.03/1999
MedlinePgn 21,308,661 21,308,661 0/1.00/1 1/5.70/173
ELocationID 4,447,928 4,795,760 0/1.08/2 0/0.00/0
Valid Yes   4,795,760    
Valid No   0    
EIdType=doi   4,411,732    
EIdType=pii   384,028    
Abstract        
AbstractText 14,011,224 14,011,224 0/1.00/1 24/1226.97/9996
CopyrightInformation 1,290,771 1,290,771 0/1.00/1 1/54.23/554
Identified as Structured Abstract 2,579,236      
AbstractText 2,579,236 10,912,234 1/4.23/22  
NLMCategory: UNLABELLED 68,542 68,542    
NLMCategory: BACKGROUND 1,118,121 1,138,638    
NLMCategory: OBJECTIVE 1,702,987 1,707,880    
NLMCategory: METHODS 2,340,938 2,949,270    
NLMCategory: RESULTS 2,425,823 2,430,599    
NLMCategory: CONCLUSIONS 2,533,761 2,603,684    
NLMCategory: UNASSIGNED 10,960 13,621    
Author 20,889,141 79,322,162 0/3.80/3173 1/12.37/489
Valid Yes   79,305,010    
Valid No   17,152    
LastName 20,862,667 79,182,715 0/3.80/3172 1/6.72/129
ForeName 20,853,580 79,138,466 0/3.79/3172 1/4.17/111
Initials 20,853,580 79,138,465 0/3.79/3172 1/1.42/8
Suffix 357,968 377,789 0/1.06/7 2/2.21/3
CollectiveName 127,600 139,447 0/1.09/29 1/41.89/489
LastForeSuffix 20,862,667 79,182,715 0/3.80/3172 1/10.90/130
LastInitialsSuffix 20,862,667 79,182,715 0/3.80/3172 1/8.15/130
Affiliation 13,157,334 14,123,044 0/1.07/2937 1/106.18/2000
Identifier 4,059 7,000 0/1.72/18 16/20.76/51
Language 21,332,373 21,374,873 1/1.00/6 3/3.00/3
Grant 2,145,857 5,254,388 0/2.45/357 14/38.18/110
GrantID 2,066,656 5,111,288 0/2.47/357 1/10.58/66
Acronym 1,912,765 4,801,832 0/2.51/357 2/2.00/2
Agency 2,145,857 5,254,388 0/2.45/357 2/13.09/84
Country 2,145,857 5,254,388 0/2.45/357 5/12.97/14
PublicationType 21,332,373 39,504,308 1/1.85/10 4/18.35/56


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 2,715,109 2,715,109 0/1.00/1 1/79.67/611
Country 21,332,373 21,332,373 1/1.00/1 4/9.92/35
MedlineTA 21,332,373 21,332,373 1/1.00/1 1/15.41/96
NlmUniqueID 21,332,373 21,332,373 1/1.00/1 7/7.29/9
ISSNLinking 20,943,017 20,943,017 0/1.00/1 9/9.00/9
Chemical 11,077,178 43,210,327 0/3.90/58 4/21.22/250
RegistryNumber 11,077,178 43,210,327 0/3.90/58 1/4.68/15
NameOfSubstance 11,077,178 43,210,327 0/3.90/58 2/16.54/249
SupplMeshName 48,634 54,359 0/1.12/10 5/22.31/177
Type=Disease 30,746 32,065 0/1.04/5 5/28.45/177
Type=Protocol 17,928 22,294 0/1.24/10 5/13.47/43
CitationSubset 19,948,548 22,971,207 0/1.15/6 1/1.99/3
GeneSymbol 59,508 126,194 0/2.12/25 1/4.51/41
CommentsCorrections 3,130,743 64,736,085 0/20.68/4916 8/45.56/827
RetractionOf 3,240 3,528 0/1.09/20 25/94.87/344
RetractionIn 3,351 3,382 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 521,017 659,815 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 2,356 2,393 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 2,071,050 63,264,920 0/30.55/4916 22/45.54/198
MeshHeading 19,942,995 217,070,142 0/10.88/68 2/20.38/204
DescriptorName 19,942,995 217,070,142 0/10.88/68 2/14.11/104
Descriptor Major 9,904,816 17,221,196 0/1.74/37  
Descriptor Not Major 19,844,618 196,175,734 0/9.89/63  
QualifierName 18,717,383 121,268,358 0/6.48/71 5/11.22/29
Qualifier Major 17,922,245 52,295,978 0/2.92/52  
Qualifier Not Major 15,183,024 68,972,380 0/4.54/71  
Descriptor and/or Qualifier Major 19,813,750 66,853,241 0/3.37/50  
PersonalNameSubject 140,612 162,583 0/1.16/28 3/12.21/75
LastName 140,612 162,583 0/1.16/28 1/7.36/69
ForeName 136,323 156,911 0/1.15/28 1/3.60/48
Initials 136,323 156,911 0/1.15/28 1/1.42/6
Suffix 1,129 1,160 0/1.03/3 2/2.10/3
LastForeSuffix 140,612 162,583 0/1.16/28 3/10.84/73
LastInitialsSuffix 140,612 162,583 0/1.16/28 2/8.74/69


Element Name Citations Occurrences Min/Avg/Max
Occurrences
Min/Avg/Max
Length
NumberOfReferences 1,538,075 1,538,075 0/1.00/1 1/2.10/8
OtherID 2,670,637 3,134,396 0/1.17/6 1/10.08/36
NLM Source   2,822,725    
OtherAbstract        
AbstractText 66,981 67,542 0/1.01/5 38/1179.23/4096
CopyrightInformation 1,855 1,855 0/1.00/1 11/16.80/17
Keyword 614,445 4,133,148 0/6.73/245 1/16.04/259
Keyword Major 80,771 523,609 0/6.48/50  
Keyword Not Major 613,239 3,609,539 0/5.89/245  
GeneralNote 149,386 282,800 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 1,539
Words in Title Average 12.11
Words in Title Max 341
Words in Abstract Average 185.33
Words in Abstract 1,696
AB Size Zero 7,321,149
AB Size < 1,000 4,958,293
AB Size 1,000 - 1,999 8,161,106
AB Size 2,000 - 2,999 844,435
AB Size 3,000 - 3,999 40,924
AB Size 4,000 - 4,999 4,451
AB Size > 5,000 2,015
Number of MH Occurrences with NO SHs 129,974,757
Number of MH Occurrences with ONE SH 60,882,723
Number of MH Occurrences with SHs 87,095,385
Number of MH Type=Geographic 3,673,212


CollectiveName, Author, and Investigator Related Counts
Citations containing ONLY CollectiveName 26,474
Citations containing BOTH CollectiveName and Author LastName 101,126
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 0
Investigator Found Without Collective 0


MedlineCitation Status Counts
Completed 0
In-Process 0
In-Data-Review 0
PubMed-not-MEDLINE 1,383,825
OLDMEDLINE 0
MEDLINE 19,948,548


Article PubModel Counts
Print-Electronic 1,841,436
Electronic-Print 23,421
Print 15,094,858
Electronic-eCollection 72,306
Electronic 256,617


JournalIssue CitedMedium Counts
Internet 4,491,911
Print 16,840,462


Owner MedlineCitation GeneralNote Keyword OtherAbstract
NLM 21,200,070 4,618 0 0
NASA 10,752 4,570 12,939 409
PIP 37,861 63,794 68,852 53,145
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 4,924,921
United Kingdom 270,167
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 521,205
E 91,770
F 8,016
H 264,467
IM 18,664,377
J 68,940
K 23,787
N 626,833
OM 0
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 14,731
Biography 138,325
Case Reports 1,668,597
Classical Article 5,845
Clinical Conference 6,558
Clinical Trial 486,413
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 1,674,489
Congresses 60,751
Consensus Development Conference 9,093
Consensus Development Conference, NIH 719
Controlled Clinical Trial 88,073
Corrected and Republished Article 1,441
Dictionary 535
Directory 6,618
Duplicate Publication 1,167
Editorial 350,091
English Abstract 1,722,240
Evaluation Studies 196,374
Festschrift 1,465
Government Publications 189
Guideline 15,410
Historical Article 294,033
Interactive Tutorial 218
Publication Types Counts (continued):
Interview 24,886
Introductory Journal Article 30,290
Journal Article 19,835,732
Lectures 5,994
Legal Cases 10,417
Legislation 1,668
Letter 830,530
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 39,864
Practice Guideline 19,308
Pragmatic Clinical Trial 73
Published Erratum 1,180
Randomized Controlled Trial 376,367
Research Support, American Recovery and Reinvestment Act 1,424
Research Support, N.I.H., Extramural 745,378
Research Support, N.I.H., Intramural 36,045
Research Support, Non-U.S. Gov't 5,619,348
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 3,383
Retraction of Publication 3,305
Review 1,893,610
Scientific Integrity Review 190
Technical Report 2,260
Twin Study 6,262
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 4,095,278
DOI and PII, MedlinePgn Not Found 18,894
DOI and PII, MedlinePgn Found 328,938


PMID Versioning Counts
Version 1 21,332,095
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