Scimago Journal & Country Rank

Emergency Medical Services


United States

Universities and research institutions in United States

Subject Area and Category


Summer Communications Inc.



Publication type







The SJR is a size-independent prestige indicator that ranks journals by their 'average prestige per article'. It is based on the idea that 'all citations are not created equal'. SJR is a measure of scientific influence of journals that accounts for both the number of citations received by a journal and the importance or prestige of the journals where such citations come from It measures the scientific influence of the average article in a journal, it expresses how central to the global scientific discussion an average article of the journal is.

Total Documents

Evolution of the number of published documents. All types of documents are considered, including citable and non citable documents.

Citations per document

This indicator counts the number of citations received by documents from a journal and divides them by the total number of documents published in that journal. The chart shows the evolution of the average number of times documents published in a journal in the past two, three and four years have been cited in the current year. The two years line is equivalent to journal impact factor ™ (Thomson Reuters) metric.

Cites per documentYearValue
Cites / Doc. (4 years)19990.018
Cites / Doc. (4 years)20000.021
Cites / Doc. (4 years)20010.009
Cites / Doc. (4 years)20020.048
Cites / Doc. (4 years)20030.033
Cites / Doc. (4 years)20040.037
Cites / Doc. (4 years)20050.063
Cites / Doc. (4 years)20060.050
Cites / Doc. (4 years)20070.043
Cites / Doc. (4 years)20080.028
Cites / Doc. (3 years)19990.018
Cites / Doc. (3 years)20000.026
Cites / Doc. (3 years)20010.007
Cites / Doc. (3 years)20020.043
Cites / Doc. (3 years)20030.029
Cites / Doc. (3 years)20040.042
Cites / Doc. (3 years)20050.056
Cites / Doc. (3 years)20060.056
Cites / Doc. (3 years)20070.041
Cites / Doc. (3 years)20080.014
Cites / Doc. (2 years)19990.008
Cites / Doc. (2 years)20000.029
Cites / Doc. (2 years)20010.005
Cites / Doc. (2 years)20020.043
Cites / Doc. (2 years)20030.023
Cites / Doc. (2 years)20040.026
Cites / Doc. (2 years)20050.057
Cites / Doc. (2 years)20060.049
Cites / Doc. (2 years)20070.024
Cites / Doc. (2 years)20080.015
Total Cites 

Evolution of the total number of citations and journal's self-citations received by a journal's published documents during the three previous years.
Journal Self-citation is defined as the number of citation from a journal citing article to articles published by the same journal.

Self Cites19990
Self Cites20000
Self Cites20010
Self Cites20020
Self Cites20030
Self Cites20040
Self Cites20050
Self Cites20060
Self Cites20070
Self Cites20080
Total Cites19993
Total Cites20005
Total Cites20012
Total Cites200215
Total Cites200313
Total Cites200420
Total Cites200531
Total Cites200632
Total Cites200722
Total Cites20087
External Cites per Doc 
Cites per Doc

Evolution of the number of total citation per document and external citation per document (i.e. journal self-citations removed) received by a journal's published documents during the three previous years. External citations are calculated by subtracting the number of self-citations from the total number of citations received by the journal’s documents.

External Cites per document19990.018
External Cites per document20000.026
External Cites per document20010.008
External Cites per document20020.045
External Cites per document20030.031
External Cites per document20040.042
External Cites per document20050.057
External Cites per document20060.057
External Cites per document20070.041
External Cites per document20080.014
Cites per document19990.018
Cites per document20000.026
Cites per document20010.007
Cites per document20020.043
Cites per document20030.029
Cites per document20040.042
Cites per document20050.056
Cites per document20060.056
Cites per document20070.041
Cites per document20080.014
% International Collaboration

International Collaboration accounts for the articles that have been produced by researchers from several countries. The chart shows the ratio of a journal's documents signed by researchers from more than one country; that is including more than one country address.

YearInternational Collaboration
Citable documents 
Non-citable documents

Not every article in a journal is considered primary research and therefore "citable", this chart shows the ratio of a journal's articles including substantial research (research articles, conference papers and reviews) in three year windows vs. those documents other than research articles, reviews and conference papers.

Non-citable documents19990
Non-citable documents20001
Non-citable documents200117
Non-citable documents200222
Non-citable documents200323
Non-citable documents20049
Non-citable documents20057
Non-citable documents20065
Non-citable documents20073
Non-citable documents20084
Citable documents1999171
Citable documents2000191
Citable documents2001265
Citable documents2002330
Citable documents2003422
Citable documents2004472
Citable documents2005542
Citable documents2006565
Citable documents2007531
Citable documents2008513
Cited documents 
Uncited documents

Ratio of a journal's items, grouped in three years windows, that have been cited at least once vs. those not cited during the following year.

Uncited documents1999168
Uncited documents2000189
Uncited documents2001280
Uncited documents2002337
Uncited documents2003432
Uncited documents2004466
Uncited documents2005521
Uncited documents2006546
Uncited documents2007514
Uncited documents2008510
Cited documents19993
Cited documents20003
Cited documents20012
Cited documents200215
Cited documents200313
Cited documents200415
Cited documents200528
Cited documents200624
Cited documents200720
Cited documents20087
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Metrics based on Scopus® data as of April 2022
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