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