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Table 4 AIS severity changes in AIS08 for rarely assigned and frequently assigned AIS98 codes in VSTR.

From: Assessment of the effects and limitations of the 1998 to 2008 Abbreviated Injury Scale map using a large population-based dataset

AIS injury severity All AIS98 codes Rarely assigned codes Frequently assigned codes
Codes % of code type Codes % of code type
Same in AIS08 1109 581 85.6% 31 72.1%
Increases in AIS08 9 6 0.9% 0 0.0%
Decreases in AIS08 61 17 2.5% 7 16.3%
Has multiple severity levels in AIS08 9 1 0.1% 2 4.7%
No map currently available 153 74 10.9% 3 7.0%
Total 1341 679 100.0% 43 100.0%