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Tracking : PWS_Inventory_more_metadata


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Maryland PWS Inventory Information


Description: Maryland Carbon Monoxide Emergency Department Visits 2000-2009
Owner Maryland HSCRC
Original Home Maryland EPHT Program
Years Available 20000101 - 20091231
Method of Measurement
Tracking Link


These Maryland emergency visits data are used as a basis to quantify the occurrence of emergency department visits for the three CO outcomes. They are also used to compute indicators. Queries can be constructed on the Maryland Tracking Network public portal to display totals, percentages and age standardized rates per 10,000 persons over time (years) and location (counties). Rates for these three CO measures can be selected and displayed in a GIS as computer maps for use on the Maryland Tracking Network public portal GIS tab. The use of these emergency department visit measures for CO on the Maryland Tracking Network public portal internet site will permit analyses of individual chronic diseases and, on the secure portal, assessment of sub-county spatial-temporal trends in linked environmental hazard dataset with this emergency department visits dataset. The Maryland Tracking Network secure portal, which is accessible to pre-approved persons who have been given a login ID and password, will contain emergency department visits data in residential zip codes. De-identified Maryland emergency visits records for CO are also sent to the Centers for Disease Control and Prevention for inclusion on the National Environmental Public Health Tracking Network.


Total Counties in the State
24 Jurisdictions, including Baltimore City

Counties included in data:

Why these data are important?

This emergency visits data set approximates a population-based estimate of CO exposure in Maryland. It is a useful Environmental Public Health Tracking dataset because it includes space-time descriptors for CO exposure as an environmental hazard. On the Maryland Tracking Network public portal this emergency department visits data set contains location information in terms of residential county and time recorded as year. On the Maryland Tracking Network secure portal emergency department visits are aggregated into residential zip codes and time, also year of event. Emergency department events are selected based on admission date. It is possible that this data set underestimates the total number of emergency visits which occur each year in Maryland because some Maryland residents may go emergency department hospitals in other nearby states or the District of Columbia.

Keywords: Carbon Monoxide, CO, 986, E8682, E8683, E8688, E8689, E9520, E9521, E9820, E9821


Are any of these data confidential
? No
There are no restrictions on the use or distribution of the de-identified, county aggregated Maryland emergency department visits data available from the Maryland Tracking Network public portal when cell totals are at least six. If cell totals are 1-5, the cell count is suppressed. But, for sub-county aggregated emergency visits data, such as residential five digit zip codes, there are guidelines in place for the release of data and how results are presented. Requests to obtain individual record data in the emergency department confidential file can be sent to the Center for Environmental Health Coordination. The request for individual record data has to include a data analysis protocol which has been approved by the Maryland Department of Health and Mental Hygiene Institutional Review Board. In the data sharing agreement with the Maryland Health Care Commission, the Center for Environmental Health Coordination is authorized to approve data requests, provided they are consistent with Maryland Helath Care Commission data release, analysis and reporting guidelines. These Maryland Health Care Commission data release requirements are available from the Center for Environmental Health Coordination. These county agregated CO data are available from the Maryland Tracking Network public portal.

Can I download the data from the MTN? Yes

There are no constraints on the use of CO de-identified and county aggregated emergency department visit data that are available from the Maryland Tracking Network public portal. Use of sub-county aggregated emergency department data are handled on a case-by-case basis. Persons interested in obtaining customized emergency department data should contact the Center for Environmental Health Coordination. Contact information is provided at the end of this metadata file. To satisfy data access requirements, the person has to describe the purpose of the data analysis project, requested data set, what variables should be included in the data request, what analyses will be carried out, how the results will be used and presented. Presentations based on the use of sub-county emergency department data have to be approved by the Center for Environmental Health Coordination before results can be released.

Is more detailed data available from the original home? Yes

Persons are asked to first visit the MTN web site to determine if the requested data described in this metadata file, are available from the MTN public or secure portal, and can be used to satisfy the user's data requirements. This initial step should be completed before a customized data request is prepared and submitted to the CEHC. If other data elements are needed, which are not available from the MTN, go to the MTN to view instructions which describe the preparation of a formal data request. Assistance in completing a data request can be obtained through the sources listed in the Distribution Section. Contact options include an e-mail address and telephone number.

How often does the MTN get these data? Annually

Were the data checked for completeness and validity? Yes

Record completeness is established by the Saint Paul Computer Center, a sub-contractor to the Maryland Health Services Cost Review Commission before each emergency department visits file is released. Additional quality assurance and quality control checks were completed once the emergency visit data were received. The obtianed dataset were evaluated for consistency in entered versus computed age, incorrently entered inconsistent values, duplicate records, etc. For the most part, the outcomes of these analyses showed that there were no irregularities in the emergency visit files received.


Maryland EPHT Program
Name:EPHT Coordinator/Epidemiologist
Organization:Maryland Department of Health and Mental Hygiene