Skip Navigation LinksSkip Navigation Links
Centers for Disease Control and Prevention

CDC Home Search Health Topics A-Z

Persons using assistive technology might not be able to fully access information in this file. For assistance, please send e-mail to: Type 508 Accommodation and the title of the report in the subject line of e-mail.

QuickStats: Percentage of Weekly Visits to Emergency Departments for Illness and Injury by Patients Arriving via Ambulance,* by Day/Night Period of Arrival --- United States, 2003--2004

* Air, ground, private, or public ambulances, including fire and rescue vehicles.

Day is 3:00 a.m. to 5:59 p.m., and night is 6:00 p.m. to 2:59 a.m.

Percentages indicate the proportion of weekly visits for illness or injury distributed over 14 periods (day and night). Overall, persons who arrive by ambulance at an emergency department (ED) are more likely to do so because of illness (57%) than injury (43%). However, on Saturdays, ambulances are more likely to bring persons with injuries than illnesses, both during the day and at night. Ambulance-transported patients account for approximately 15% of all ED visits and 16 million patients annually.

SOURCE: National Hospital Ambulatory Medical Care Survey, 2003--04. Available at

Use of trade names and commercial sources is for identification only and does not imply endorsement by the U.S. Department of Health and Human Services.

References to non-CDC sites on the Internet are provided as a service to MMWR readers and do not constitute or imply endorsement of these organizations or their programs by CDC or the U.S. Department of Health and Human Services. CDC is not responsible for the content of pages found at these sites. URL addresses listed in MMWR were current as of the date of publication.

Disclaimer   All MMWR HTML versions of articles are electronic conversions from ASCII text into HTML. This conversion may have resulted in character translation or format errors in the HTML version. Users should not rely on this HTML document, but are referred to the electronic PDF version and/or the original MMWR paper copy for the official text, figures, and tables. An original paper copy of this issue can be obtained from the Superintendent of Documents, U.S. Government Printing Office (GPO), Washington, DC 20402-9371; telephone: (202) 512-1800. Contact GPO for current prices.

**Questions or messages regarding errors in formatting should be addressed to

Date last reviewed: 3/1/2007




Safer, Healthier People

Morbidity and Mortality Weekly Report
Centers for Disease Control and Prevention
1600 Clifton Rd, MailStop E-90, Atlanta, GA 30333, U.S.A


Department of Health
and Human Services