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About Injury ED Data

About Injury ED data

Emergency Department Discharge data are used to track fireworks injuries in Iowa.

This page provides general information about fireworks injury data and measures developed by the Iowa Public Health Tracking program. Contact Us for more information about these data.

Information on this page:

What do these data tell us?

  • The numbers and rates of fireworks-related emergency department visits in Iowa by year, age group and gender.
  • If fireworks injuries are going up or down over time.
  • If a segment of a population is at higher risk for a visit to the emergency department due to fireworks.

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How can we use this data?

  • To inform the public about fireworks-related emergency department visits.
  • For program planning and evaluation by state and local partners.

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What can these data not tell us?

  • What factors contribute to fireworks injuries, or what leads to fireworks-related emergency department visits
  • The total burden of fireworks injury in a population.
  • The number of people who visited the emergency department due to fireworks injury. Because personal identifiers are removed from the hospital discharge data before analysis, individuals who have multiple emergency department visits cannot be identified.

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What is the source of the data?

  • Emergency department data are collected by the Iowa Hospital Association on behalf of IDPH in accordance with Iowa Code section 135.166.
  • Bridged-race population estimates from the National Center for Health Statistics and US Census. Data from 2000 to 2009 are based on intercensal population estimates and 2010-most current year are based on the postcensal population estimates.

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What time period of data is available?

  • The Iowa Public Health Tracking portal displays Emergency Department visit data from the year 2003 through the most recent year of data available.
  • There is usually a two-year lag period before hospitalization and emergency department visit data are available.

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How are fireworks-related emergency department visits identified?

  • Emergency Department visits are defined as Iowa residents who are treated and released or subsequently admitted to a facility in Iowa.
  • Fireworks-related emergency department visits have accidents due to fireworks as the first-listed cause of injury.
  • Fireworks injury is defined as the International Classification of Disease 9th Revision, Clinical Modification (ICD-9-CM) code E923.0.
  • Fireworks injury is defined as the International Classification of Disease 10th Revision, Clinical Modification (ICD-10-CM) codes that begin with W39.

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What is the difference between a number, rate, age-adjusted rate, and age-specific rate? How would I use them?

Number:

  • If you want to understand the magnitude or how big the overall burden is, then use the number.
  • The number indicates the total number of emergency department visits due to fireworks, but not the number of unique individuals who visited the emergency department.
  • To protect an individual's privacy, counts of 5 or less are suppressed.

Crude Rate:

  • If you want to understand the probability or what is the underlying risk in a population, then use a rate.
  • In our analysis a rate is calculated using a numerator, the number of fireworks-related injury emergency department visits during a period of time, divided by a denominator, the number of people in a population during the same period of time. This fraction is then multiplied by 100,000 to provide a more recognizable value.
  • To protect an individual's privacy, rates based on counts of 5 or less are suppressed.

Age-adjusted rate:

  • Age-adjusted rates are useful when comparing the rates of two population groups that have different age distributions.
  • A weighted average, called the direct method, is used to adjust for age in this analysis. Age specific rates in a given population are adjusted to the age distribution in a standard population by applying a weight. The U.S. 2000 Standard population is used as the basis for weight calculations.
  • To protect an individual's privacy, rates based on counts of 5 or less are suppressed.

Age-specific rate:

  • A rate of an event (such as disease or death) measured within a particular age group. It is similar to a crude rate but is calculated within an age group (e.g. an age-specific rate of fireworks-related emergency department visits in adults 35-44 years of age).
  • To protect an individual's privacy, rates based on counts of 5 or less are suppressed.

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What are the limitations of the data?

  • Multiple emergency department visits by the same patient cannot be identified, and are not excluded.
  • These data are not appropriate for estimating the total burden of fireworks-related injury.
  • Iowa residents discharged from hospitals in surrounding states are not included, so hospitalization and emergency department visit rates for counties in which residents are likely to receive care in a surrounding state may be underestimated. Rates for counties in which residents are likely to visit hospitals that do not submit data to the Iowa Hospital Association (e.g., Veteran's Administration, Indian Health Services hospitals, and institutionalized populations) may also be artificially low.
  • There is usually a two-year lag period before emergency department visit data are available.

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Where can I find more technical information about the data?

Contact Us to learn more about fireworks-related injury emergency department visit data, or any of the measures displayed on the Iowa Public Health Tracking Portal.

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