Development and validation of a complementary map to enhance the existing 1998 to 2008 Abbreviated Injury Scale map

Table 2 Differences in calculated ISS and NISS amongst pairs of AIS datasets.

Datasets being compared	AIS98 & AIS08		AIS08 & Map08		AIS98 & Map98		AIS08 & EMap08		AIS08 & EMap08+F
Datasets being compared	ISS	NISS	ISS	NISS	ISS	NISS	ISS	NISS	ISS	NISS
Score unchanged	50	40	64	64	76	72	89	76	92	81
Score increased	0	0	7	11	2	6	10	17	8	17
1 - 4 points			1	1		2	1	1		1
5 - 8 points			6	10	2	4	9	16	8	16
Score decreased	58	68	30	26	30	30	9	15	8	10
1 - 4 points	2	3	10	4	1	3	5	5	4	3
5 - 8 points	36	34	10	13	26	25	4	9	4	7
9 - 15 points	18	23	8	7	3	2		1
16 - 24 points	2	7	2	2
25 points +		1
Score not calculable*	1	1	8	8	1	1	1	1	1	1
Total	109	109	109	109	109	109	109	109	109	109
Maximum difference in scores	22	33	20	20	12	12	7	9	7	7
Mean absolute difference	4.3	5.8	2.5	2.7	2.0	1.9	0.9	1.7	0.8	1.4

In each pair of datasets, the second dataset listed is compared with the first. The number of patients whose scores increased or decreased in comparing datasets is shown, along with maximum and mean score differences.
* Included one patient with drowning injury only coded in AIS08.

ISSN: 1757-7241