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The next several sections analyze available statistics for direct use of EVS resources on EVS servers. This section covers direct use of NCI-hosted EVS terminology browsers and the LexEVS local java API that supports them. Later sections cover the LexEVS distributed (remote), LexEVS caGrid services, the term suggestion site, and ftp download services.

The EVS browsers and LexEVS APIs at NCI are covered by the AWStats and Wusage applications, recording various statistics including number of unique visitors, visits, number of pages viewed and data volume accessed. These have been collected below to give a window into the use of the EVS services. Appendix 1 lists the usage tracking pages from which these statistics are gathered.

We are now able to identify and exclude most web crawler and similar automated hits, as well as internal use for testing and development purposes. Detailed examination of addresses and patterns of use suggest that the use reported below overwhelmingly represents real users from NCI and other organizations of interest. Analyzed below are figures for unique visitors and number of visits, as well as the volume of data communicated, which for all but ftp sites reflects high volumes of traffic in mostly compact units of terminology concept data.

Statistical Overview

The EVS browsers run off the LexEVS local API, and provide the highest number of direct users of EVS terminology servers. The lowest, but most informative, numbers are for unique visitors and number of visits. The number of unique visitors to the EVS family of browsers has averaged around 4,000 per month over the past year, generating a total of around 7,000 visits per month.

Unique visitors to EVS browsers, per month
Chart showing unique visitors to EVS browsers per month





NCI Term Browser (many terminologies, value sets and mappings)


NCI Thesaurus Browser (now one face of NCITerms, counted separately)


NCI Metathesaurus Browser (separate app, searchable from NCITerms)


EVS Term Suggestion site (covered later)

Number of visits to EVS browsers, per month 
Chart showing number of visits to EVS browsers per month

Browser Users

The EVS browsers see a large volume of usage each month, so only one 3-month period was chosen for detailed analysis. The data below is from January 2012 through May 2012, the last full quarter for which we have data. It shows an overall view of which domains hit EVS browsers most heavily, and then breaks down each domain by top users. All browsers are put together for this analysis, as they all use the same API to get data and have a similar user base.

Overall Use

The amount of bandwidth used was divided into four (4) major groups: Government .gov users, private .com and .net users, Educational .edu institutions, and Organizations .org. The data was analyzed and bots were discarded to avoid skewing the data.

Data accessed (MB) from EVS browsers by domain




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com/ net

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Data accessed (MB) from EVS browsers by domain
Chart showing data accessed (MB) from EVS browsers by domain

Users from .gov domain

The numbers below show the top government users of the EVS browsers, as measured by the MB of data that were accessed. Agency names have been provided where they are known.  The main users are internal to NCI and NIH, which is not surprising, but we have significant usage from FDA.

Top .gov EVS browser users: Data accessed (MB)




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State of Montana

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Irish Government

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California Department of Health Care Services

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Social Security Administration

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 Top .gov EVS browser users: Data accessed (MB)
Chart showing top 10 non-CBIIT .gov EVS browser users: data accessed

Users from .com domain

We combined the .net and .com users into one group as both contained a number of private corporations and individual users from a wide variety of ISPs (collectively labeled as ISP). Business names have been provided where known. The graph below does not fully show ISPs they dwarf the next largest groups.

Top .com EVS browser users: Data accessed (MB)




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Lockheed Martin

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Ingenuity Systems

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IBM Rochester

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Johnson and Johnson

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Top .com EVS browser users: Data accessed (MB)
Chart showing top .com EVS browser users: Data accessed

Users from .edu domain

The edu users were widely distributed across many American universities and a small selection of foreign institutions.

Top .edu EVS browser users: Data accessed (MB)



San Diego Supercomputer Center

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Mayo Clinic

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University of Pittsburgh

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University of Chicago

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Princeton University

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Medical College of Wisconsin

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MD Anderson Cancer Center - University of Texas

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University of Wisconsin

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Johns Hopkins Medicine

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Columbia University Medical Center

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Top .edu EVS browser users: Data accessed (MB) [Mayo truncated]
Chart showing top 10 .edu EVS browser users: Data accessed (MB) Mayo truncated

Users from .org domain

Like the .edu users, the .org users were widely distributed across a variety of organizations.

Top .org EVS browser users: Data accessed (MB)



The National Marrow Donor Program

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Fred Hutchinson Cancer Research Center

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Partners HealthCare

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American College of Cardiology

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City of Hope

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Cleveland Clinic

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RTI International

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The MITRE Corporation

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Top .org EVS browser users: Data accessed (MB)
Chart showing top 10 .org EVS browser users: data accessed





Usage Patterns of the Three EVS Browsers

The three browsers offered by EVS are:

NCITermsNCI Term Browser: Access to all terminologies, value sets and mappings.
NCItNCI Thesaurus Browser: Now just one face of NCITerms, but the most used and counted separately.
NCImNCI Metathesaurus Browser: A separate application, searchable from NCITerms.


broswer usage pie chart

Nearly 75% of all use goes to the NCIt browser, including almost all use from the educational domain and two thirds of government use.  By contrast, half of commercial domain use goes to NCI Terms, while .org use is almost evenly split between all three browsers.

dot com browser usage pie chart  dot edu browser usage pie chart dot gov browser usage pie chartdot org browser usage pie chart

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