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2012 MEDLINE/PubMed Baseline Excluding OLDMEDLINE Data: 18,491,039 Citations Found

Element Name
Citations
Occurrences
Min/Avg/Max Occurrences
Min/Avg/Max Length
PMID
18,491,039
18,491,039
1/1.00/1
1/7.41/8
DateCreated
18,491,039
18,491,039
1/1.00/1
8/8.00/8
DateCompleted
18,491,039
18,491,039
1/1.00/1
8/8.00/8
DateRevised
15,212,388
15,212,388
0/1.00/1
8/8.00/8
ISSN
18,394,744
18,394,744
0/1.00/1
9/9.00/9
   IssnType=Electronic
0
2,276,984
0
0
   IssnType=Print
0
16,117,760
0
0
Volume
18,125,469
18,125,469
0/1.00/1
1/2.25/50
Issue
17,506,675
17,506,675
0/1.00/1
1/1.45/30
PubDate
18,491,039
18,491,039
1/1.00/1
4/7.34/38
Title
18,491,039
18,491,039
1/1.00/1
2/37.84/595
ISOAbbreviation
18,491,015
18,491,015
0/1.00/1
1/16.50/96
ArticleTitle
18,491,039
18,491,039
1/1.00/1
2/86.59/1086
MedlinePgn
18,485,072
18,485,072
0/1.00/1
1/5.70/176
ELocationID
126,201
136,829
0/1.08/2
0/0.00/0
    Valid Yes
0
136,829
0
0
    Valid No
0
0
0
0
    EIdType=doi
0
103,074
0
0
    EIdType=pii
0
33,755
0
0
Abstract
0
0
0
0
    AbstractText
11,605,544
11,605,544
0/1.00/1
50/1205.02/9996
    CopyrightInformation
578,002
578,002
0/1.00/1
1/47.11/422
    Identified as Structured Abstract
1,817,573
0
0
0
Affiliation
10,670,140
10,670,140
0/1.00/1
1/100.94/496
Author
18,079,523
65,085,230
0/3.60/3173
1/12.06/500
    Valid Yes
0
65,073,129
0
0
    Valid No
0
12,101
0
0
    LastName
18,056,859
64,981,802
0/3.60/3172
1/6.83/163
    ForeName
18,048,362
64,942,549
0/3.60/3172
1/3.75/74
    Initials
18,048,361
64,942,544
0/3.60/3172
1/1.43/8
    Suffix
328,002
346,431
0/1.06/7
2/2.21/3
    CollectiveName
94,928
103,428
0/1.09/29
1/42.10/500
    LastForeSuffix
18,056,859
64,981,802
0/3.60/3172
1/10.59/163
    LastInitialsSuffix
18,056,859
64,981,802
0/3.60/3172
1/8.27/163
Language
18,491,039
18,522,700
1/1.00/4
3/3.00/3
Grant
1,746,565
3,612,143
0/2.07/216
21/37.50/94
    GrantID
1,679,025
3,518,511
0/2.10/216
1/10.20/50
    Acronym
1,612,000
3,387,487
0/2.10/216
2/2.00/2
    Agency
1,746,565
3,612,143
0/2.07/216
3/12.69/54
    Country
1,746,565
3,612,143
0/2.07/216
5/13.00/14
DataBank
209,004
212,383
0/1.02/4
5/95.15/47047
    DataBankName
209,004
212,383
0/1.02/4
3/7.07/18
    AccessionNumber
209,004
2,432,026
0/11.64/5880
2/7.69/14
PublicationType
18,491,039
34,509,752
1/1.87/10
4/18.10/56
ArticleDate
2,073,442
2,073,442
0/1.00/1
8/8.00/8
VernacularTitle
2,633,828
2,633,828
0/1.00/1
1/81.14/614
Country
18,491,039
18,491,039
1/1.00/1
4/9.93/35
MedlineTA
18,491,039
18,491,039
1/1.00/1
1/15.36/96
NlmUniqueID
18,491,039
18,491,039
1/1.00/1
7/7.23/9

Element Name
Citations
Occurrences
Min/Avg/Max Occurrences
Min/Avg/Max Length
ISSNLinking
18,230,525
18,230,525
0/1.00/1
9/9.00/9
Chemical
9,796,289
37,923,680
0/3.87/57
4/20.76/250
    RegistryNumber
9,796,289
37,923,680
0/3.87/57
1/4.35/14
    NameOfSubstance
9,796,289
37,923,680
0/3.87/57
2/16.41/249
SupplMeshName
22,133
26,373
0/1.19/10
5/16.98/111
    Type=Disease
6,037
6,253
0/1.04/5
6/28.34/111
    Type=Protocol
16,107
20,120
0/1.25/10
5/13.46/43
CitationSubset
17,674,830
20,499,424
0/1.16/6
1/1.99/3
GeneSymbol
59,509
126,195
0/2.12/25
1/4.51/41
CommentsCorrections
2,254,057
37,173,329
0/16.49/4881
8/45.09/835
    RetractionOf
1,820
1,990
0/1.09/11
25/95.04/344
    RetractionIn
1,921
1,942
0/1.01/2
27/63.01/341
    SummaryForPatientsIn
910
924
0/1.02/3
29/45.27/62
    OriginalReportIn
879
924
0/1.05/3
32/47.77/68
    CommentOn
471,166
518,379
0/1.10/27
8/45.58/215
    CommentIn
419,437
524,121
0/1.25/57
24/48.09/125
    ErratumIn
105,909
107,634
0/1.02/5
9/42.35/835
    ErratumFor
1,077
1,099
0/1.02/7
8/46.02/104
    ReprintIn
1,739
1,765
0/1.01/3
27/50.31/92
    ReprintOf
1,668
1,676
0/1.00/4
26/49.36/148
    RepublishedFrom
1,375
1,380
0/1.00/2
19/45.46/110
    RepublishedIn
1,177
1,182
0/1.00/2
26/47.32/92
    UpdateIn
3,498
3,528
0/1.01/2
33/49.26/59
    UpdateOf
3,527
3,527
0/1.00/1
31/49.00/100
    PartialRetractionOf
32
33
0/1.03/2
32/113.18/211
    PartialRetractionIn
32
32
0/1.00/1
36/83.12/199
    Cites
1,367,887
36,003,193
0/26.32/4881
22/45.04/198
MeshHeading
17,670,634
189,669,766
0/10.73/68
2/20.21/204
    DescriptorName
17,670,634
189,669,766
0/10.73/68
2/14.01/104
       Descriptor Major
8,726,058
15,153,848
0/1.74/37
0
       Descriptor Not Major
17,576,627
171,317,265
0/9.75/63
0
    QualifierName
16,518,980
104,646,817
0/6.33/71
5/11.24/29
       Qualifier Major
15,773,287
44,900,125
0/2.85/30
0
       Qualifier Not Major
13,435,002
59,746,692
0/4.45/71
0
    Descriptor and/or Qualifier Major
17,540,883
57,950,490
0/3.30/37
0
NumberOfReferences
1,538,494
1,538,494
0/1.00/1
1/2.10/8
PersonalNameSubject
131,909
152,092
0/1.15/28
3/12.03/70
    LastName
131,909
152,092
0/1.15/28
2/7.43/69
    ForeName
127,765
146,634
0/1.15/28
1/3.33/48
    Initials
127,756
146,624
0/1.15/28
1/1.42/6
    Suffix
1,055
1,082
0/1.03/3
2/2.10/3
    LastForeSuffix
131,909
152,092
0/1.15/28
3/10.66/69
    LastInitialsSuffix
131,909
152,092
0/1.15/28
3/8.82/69
OtherID
1,839,486
2,122,544
0/1.15/5
1/10.15/36
    NLM Source
0
1,810,790
0
0
OtherAbstract
0
0
0
0
    AbstractText
61,931
61,971
0/1.00/2
60/1284.21/4096
    CopyrightInformation
1,856
1,856
0/1.00/1
11/16.80/17

Element Name
Citations
Occurrences
Min/Avg/Max Occurrences
Min/Avg/Max Length
Keyword
155,285
1,587,880
0/10.23/98
2/17.03/123
Keyword Major
80,857
523,970
0/6.48/50
0
Keyword Not Major
154,079
1,063,910
0/6.90/88
0
GeneralNote
147,108
280,472
0/1.91/32
2/34.30/704
SpaceFlightMission
4,189
19,399
0/4.63/12
6/13.87/28
InvestigatorList
21,702
0
0
0
Investigator: Inclusive (pre-2008 Policy)
8,951
10,306
0/1.15/6
7/31.04/96
LastName
8,951
10,306
0/1.15/6
2/6.70/16
ForeName
8,943
10,295
0/1.15/6
1/2.70/9
Initials
8,943
10,295
0/1.15/6
1/1.84/2
Suffix
16
16
0/1.00/1
2/2.19/3
Affiliation
8,950
10,305
0/1.15/6
3/19.81/83
LastForeSuffix
8,951
10,306
0/1.15/6
3/9.40/19
LastInitialsSuffix
8,951
10,306
0/1.15/6
3/8.54/18
Investigator: 2008 Policy
12,751
736,232
0/57.74/2079
2/12.34/66
LastName
12,751
736,232
0/57.74/2079
1/7.05/66
ForeName
12,708
728,573
0/57.33/2078
1/4.15/47
Initials
12,708
728,572
0/57.33/2078
1/1.19/6
Suffix
963
1,659
0/1.72/20
2/2.31/3
Affiliation
15
15
0/1.00/1
8/24.80/43
LastForeSuffix
12,751
736,232
0/57.74/2079
2/11.16/66
LastInitialsSuffix
12,751
736,232
0/57.74/2079
2/8.23/66

Element Name
Citations
Average Record Size in Bytes 1,505
Words in Title Average 11.91
Words in Title Max 249
Words in Abstract Average 182.4
Words in Abstract Max 1,669
AB Size Zero 6,885,495
AB Size < 1,000 4,320,815
AB Size 1,000 - 1,999 6,577,584
AB Size 2,000 - 2,999 670,268
AB Size 3,000 - 3,999 32,271
AB Size 4,000 - 4,999 3,279
AB Size > 5,000 1,327
Number of MH Occurrences with NO SHs 113,752,178
Number of MH Occurrences with ONE SH 53,755,419
Number of MH Occurrences with SHs 75,917,588
Number of MH Type=Geographic 3,198,653

CollectiveName, Author, and Investigator Related
Counts
Citations containing ONLY CollectiveName 22,664
Citations containing BOTH CollectiveName and Author LastName 72,264
Citations containing BOTH CollectiveName and Investigator LastName 12,733
Citations containing BOTH Author LastName and Investigator LastName 20,774
Citations containing Investigator LastName and Owned by NASA 3,911
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 816,209
OLDMEDLINE 0
MEDLINE 17,674,830

Article PubModel
Counts
Print-Electronic 1,902,998
Electronic-Print 5,138
Print 16,413,360
Electronic 169,543

JournalIssue CitedMedium
Counts
Internet 2,322,096
Print 16,168,943

Owner/Counts
MedlineCitation
GeneralNote
Keyword
NLM 18,361,764 2,387 0
NASA 10,725 4,570 12,946
PIP 37,392 63,811 68,934
KIE 31,972 209,640 73,831
HSR 6,990 64 0
HMD 42,196 0 0
SIS 0 0 0
NOTNLM 0 0 0

CitationSubsets
Counts
AIM 1,861,371
B 10,445
C 7,404
D 484,570
E 88,526
F 8,017
H 246,598
IM 16,476,085
J 69,022
K 21,068
N 576,388
OM 0
Q 200,496
QIS 4,516
QO 24,474
R 3,603
S 184,570
T 47,373
X 184,898

Grant Country
Counts
United States 3,483,004
United Kingdom 111,067
Canada 16,050
Italy 1,911
Austria 93
Ireland 18

Publication Types
Counts
Addresses 3,799
Bibliography 14,174
Biography 129,689
Case Reports 1,513,140
Classical Article 5,278
Clinical Conference 6,061
Clinical Trial 463,597
Clinical Trial, Phase I 11,375
Clinical Trial, Phase II 18,140
Clinical Trial, Phase III 6,341
Clinical Trial, Phase IV 639
Comment 471,167
Comparative Study 1,536,571
Congresses 56,124
Consensus Development Conference 7,571
Consensus Development Conference, NIH 674
Controlled Clinical Trial 82,886
Corrected and Republished Article 1,375
Dictionary 528
Directory 6,591
Duplicate Publication 966
Editorial 286,398
English Abstract 1,599,750
Evaluation Studies 155,010
Festschrift 1,306
Government Publications 186
Guideline 14,907
Historical Article 271,584
In Vitro 362,872
Interview 22,058
Journal Article 17,202,533
Lectures 5,256
Legal Cases 9,649
Legislation 1,666
Letter 728,364
Meta-Analysis 29,889
Multicenter Study 133,690
News 140,001
Newspaper Article 17,570
Overall 25,672
Patient Education Handout 3,374
Periodical Index 318
Portraits 35,294
Practice Guideline 15,789
Published Erratum 1,095
Randomized Controlled Trial 312,715
Research Support,American Recovery and Reinvestment Act 239
Research Support, N.I.H., Extramural 498,946
Research Support, N.I.H., Intramural 23,487
Research Support, Non-U.S. Gov't 4,559,215
Research Support, U.S. Gov't, Non-P.H.S. 573,845
Research Support, U.S. Gov't, P.H.S. 1,433,470
Retracted Publication 1,950
Retraction of Publication 1,852
Review 1,622,510
Scientific Integrity Review 156
Technical Report 2,050
Twin Study 4,904
Validation Studies 51,808
Video-Audio Media 1,646
Webcasts 184

ELocationId EIdType
Counts
DOI or PII, MedlinePgn Not Found 4,662
DOI or PII, MedlinePgn Found 110,911
DOI and PII, MedlinePgn Not Found 1,305
DOI and PII, MedlinePgn Found 9,323

PMID Versioning
Counts
Version 1 18,491,039