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2012 MEDLINE®/PubMed® Baseline: 20,494,848 Citations Found

Element Name
Citations
Occurrences
Min/Avg/Max Occurrences
Min/Avg/Max Length
PMID
20,494,848
20,494,848
1/1.00/1
1/7.47/8
DateCreated
20,494,848
20,494,848
1/1.00/1
8/8.00/8
DateCompleted
20,494,848
20,494,848
1/1.00/1
8/8.00/8
DateRevised
17,062,154
17,062,154
0/1.00/1
8/8.00/8
ISSN
20,215,157
20,215,157
0/1.00/1
9/9.00/9
   IssnType=Electronic
0
2,279,963
0
0
   IssnType=Print
0
17,935,194
0
0
Volume
20,117,923
20,117,923
0/1.00/1
1/2.23/50
Issue
18,675,651
18,675,651
0/1.00/1
1/1.46/30
PubDate
20,494,848
20,494,848
1/1.00/1
4/7.36/38
Title
20,494,848
20,494,848
1/1.00/1
2/37.66/595
ISOAbbreviation
20,494,819
20,494,819
0/1.00/1
1/16.51/96
ArticleTitle
20,494,848
20,494,848
1/1.00/1
2/84.50/1086
MedlinePgn
20,488,881
20,488,881
0/1.00/1
1/5.68/176
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
11,620,324
11,620,324
0/1.00/1
50/1204.66/9996
    CopyrightInformation
578,002
578,002
0/1.00/1
1/47.11/422
Identified as Structured Abstract
1,817,573
0
0
0
Affiliation
10,670,598
10,670,598
0/1.00/1
1/100.94/496
Author
20,037,260
68,448,938
0/3.42/3173
1/11.98/500
    Valid Yes
0
68,436,837
0
0
    Valid No
0
12,101
0
0
    LastName
20,014,590
68,345,497
0/3.41/3172
1/6.84/163
    ForeName
19,986,290
68,259,067
0/3.42/3172
1/3.66/74
    Initials
19,986,289
68,259,062
0/3.42/3172
1/1.43/8
    Suffix
373,292
394,469
0/1.06/7
2/2.19/3
    CollectiveName
94,941
103,441
0/1.09/29
1/42.11/500
    LastForeSuffix
20,014,590
68,345,497
0/3.41/3172
1/10.51/163
    LastInitialsSuffix
20,014,590
68,345,497
0/3.41/3172
1/8.28/163
Language
20,494,848
20,532,852
1/1.00/4
3/3.00/3
Grant
1,746,637
3,612,271
0/2.07/216
21/37.50/94
    GrantID
1,679,097
3,518,639
0/2.10/216
1/10.20/50
    Acronym
1,612,022
3,387,512
0/2.10/216
2/2.00/2
    Agency
1,746,637
3,612,271
0/2.07/216
3/12.69/54
    Country
1,746,637
3,612,271
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
20,494,848
36,582,528
1/1.78/10
4/17.92/56
ArticleDate
2,073,442
2,073,442
0/1.00/1
8/8.00/8
VernacularTitle
3,386,308
3,386,308
0/1.00/1
1/79.15/614
Country
20,494,848
20,494,848
1/1.00/1
4/10.17/35
MedlineTA
20,494,848
20,494,848
1/1.00/1
1/15.41/96
NlmUniqueID
20,494,848
20,494,848
1/1.00/1
7/7.24/9

Element Name
Citations
Occurrences
Min/Avg/Max Occurrences
Min/Avg/Max Length
ISSNLinking
20,031,857
20,031,857
0/1.00/1
9/9.00/9
Chemical
10,350,238
38,873,078
0/3.76/57
4/20.67/250
    RegistryNumber
10,350,238
38,873,078
0/3.76/57
1/4.35/14
    NameOfSubstance
10,350,238
38,873,078
0/3.76/57
2/16.32/249
SupplMeshName
22,244
26,484
0/1.19/10
5/17.00/111
    Type=Disease
6,148
6,364
0/1.04/5
6/28.20/111
    Type=Protocol
16,107
20,120
0/1.25/10
5/13.46/43
CitationSubset
19,678,639
22,528,839
0/1.14/6
1/1.99/3
GeneSymbol
59,509
126,195
0/2.12/25
1/4.51/41
CommentsCorrections
2,319,121
37,680,233
0/16.25/4881
8/45.08/835
    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
419,512
524,197
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
1,744
1,770
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
1,432,880
36,510,016
0/25.48/4881
22/45.03/198
MeshHeading
19,488,905
194,247,091
0/9.97/103
2/20.10/204
    DescriptorName
19,488,905
194,247,091
0/9.97/103
2/13.99/104
       Descriptor Major
10,105,490
18,678,160
0/1.85/103
0
       Descriptor Not Major
18,287,898
172,335,420
0/9.42/63
0
    QualifierName
17,214,765
105,650,455
0/6.14/71
5/11.23/29
       Qualifier Major
16,468,601
45,902,288
0/2.79/30
0
       Qualifier Not Major
13,435,816
59,748,167
0/4.45/71
0
Descriptor and/or Qualifier Major
19,356,078
62,467,310
0/3.23/103
0
NumberOfReferences
1,546,702
1,546,702
0/1.00/1
1/2.10/8
PersonalNameSubject
159,061
179,977
0/1.13/28
3/12.23/70
    LastName
159,061
179,977
0/1.13/28
2/7.43/69
    ForeName
151,186
170,603
0/1.13/28
1/3.63/48
    Initials
151,177
170,593
0/1.13/28
1/1.42/6
    Suffix
1,198
1,227
0/1.02/3
1/2.24/12
    LastForeSuffix
159,061
179,977
0/1.13/28
3/10.89/69
    LastInitialsSuffix
159,061
179,977
0/1.13/28
3/8.79/69
OtherID
3,110,853
3,445,774
0/1.11/5
1/11.49/391
    NLM Source
0
1,899,303
0
0
OtherAbstract
0
0
0
0
    AbstractText
61,934
61,974
0/1.00/2
60/1284.23/4096
    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
2,140,683
6,545,537
0/3.06/105
1/16.91/123
    Keyword Major
2,066,255
5,481,597
0/2.65/105
0
    Keyword Not Major
154,082
1,063,940
0/6.91/88
0
GeneralNote
147,304
280,668
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
1,396
Words in Title Average
11.64
Words in Title Max
249
Words in Abstract Average
182.35
Words in Abstract Max
1,669
AB Size Zero
8,874,524
AB Size < 1,000
4,329,929
AB Size 1,000 - 1,999
6,582,709
AB Size 2,000 - 2,999
670,732
AB Size 3,000 - 3,999
32,330
AB Size 4,000 - 4,999
3,292
AB Size > 5,000
1,332
Number of MH Occurrences with NO SHs
117,335,663
Number of MH Occurrences with ONE SH
54,739,989
Number of MH Occurrences with SHs
76,911,428
Number of MH Type=Geographic
3,233,511

CollectiveName, Author, and Investigator Related
Counts
Citations containing ONLY CollectiveName
22,670
Citations containing BOTH CollectiveName and Author LastName
72,271
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
20,774
Investigator Found Without Collective
8,969

MedlineCitation Status
Counts
Completed
0
In-Process
0
In-Data-Review
0
PubMed-not-MEDLINE
816,209
OLDMEDLINE
425,851
MEDLINE
19,252,788

Article PubModel
Counts
Print-Electronic
1,902,998
Electronic-Print
5,138
Print
18,417,169
Electronic
169,543

JournalIssue CitedMedium
Counts
Internet
2,325,228
Print
18,169,620

Owner/Counts
MedlineCitation
GeneralNote
Keyword
NLM
20,365,570
2,582
1,985,398
NASA
10,725
4,570
12,946
PIP
37,395
63,812
68,937
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
500,007
E
88,526
F
8,017
H
246,598
IM
16,476,085
J
69,025
K
21,068
N
586,554
OM
2,003,809
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
3,483,132
United Kingdom
111,067
Canada
16,050
Italy
1,911
Austria
93
Ireland
18

Publication Types
Counts
Addresses
3,799
Bibliography
14,615
Biography
156,856
Case Reports
1,540,938
Classical Article
5,278
Clinical Conference
6,064
Clinical Trial
463,599
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
1,536,577
Congresses
56,124
Consensus Development Conference
7,571
Consensus Development Conference, NIH
674
Controlled Clinical Trial
82,889
Corrected and Republished Article
1,375
Dictionary
528
Directory
6,591
Duplicate Publication
966
Editorial
286,399
English Abstract
1,599,794
Evaluation Studies
155,012
Festschrift
1,306
Government Publications
186
Guideline
14,907
Historical Article
277,279
In Vitro
362,872
   Interview
22,058
Journal Article
19,205,901
Lectures
5,257
Legal Cases
9,650
Legislation
1,666
Letter
728,373
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
35,296
Practice Guideline
15,789
Published Erratum
1,095
Randomized Controlled Trial
312,716
Research Support, American Recovery and Reinvestment Act
239
Research Support, N.I.H., Extramural
498,946
Research Support, N.I.H., Intramural
23,488
Research Support, Non-U.S. Gov't
4,559,216
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
1,630,740
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

Version 1
20,494,848