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