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Double coding and mapping using Abbreviated Injury Scale 1998 and 2005: identifying issues for trauma data.
Cameron S Palmer1, Louise E Niggemeyer, Debra Charman
1Trauma Service, Royal Children's Hospital Melbourne, Flemington Rd, Parkville 3052, Australia. cameron.palmer@rch.org.au
Adopting the Abbreviated Injury Scale 2005 (AIS05) may decrease major trauma patient numbers. Mapping AIS05 data back to AIS98 improves data comparison between trauma registry versions.
Area of Science:
- Trauma registry data analysis
- Injury severity scoring systems
- Public health surveillance
Background:
- The Abbreviated Injury Scale 2005 (AIS05) introduced significant changes from AIS98, including a larger codeset and altered injury severity.
- Global adoption of AIS05/AIS08 necessitates understanding its impact on existing trauma registries.
- The optimal method for comparing data between AIS98 and AIS05 collections remains unclear.
Purpose of the Study:
- To assess the impact of adopting the AIS05 codeset in an established trauma system.
- To identify challenges associated with transitioning from AIS98 to AIS05.
- To evaluate methods for comparing trauma data collected under different AIS versions.
Main Methods:
- A subset of major trauma patients from Victoria, Australia, were coded using both AIS98 and AIS05.
- Injuries were mapped between AIS versions using provided code lists, generating up to four codes per injury.
- Agreement in codes, injury severity, and calculated scores (ISS, NISS) were analyzed.
Main Results:
- Adopting AIS05 is projected to decrease major trauma patient classification by 22% in Victoria.
- Discrepancies between AIS versions were more common for head and chest injuries.
- Mapping AIS05 data back to AIS98 demonstrated higher agreement in AIS level, ISS, and NISS compared to other mapping methods.
Conclusions:
- Transitioning to AIS05 or AIS08 in established registries will likely reduce the count of major trauma patients.
- Code mapping enhances comparability between datasets using different AIS versions, though injury profiles influence the degree of comparability.
- Mapping AIS05 data back to AIS98 is currently recommended for improved data consistency.
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