Table 3.

Nature of Road Traffic Injury Cases (N = 1,656) by age groups, Japan, 2003

Group	1	2	3
Age (years)	18 - 64	65 - 74	75 +
Cases	1459	119	78
Anatomic region (%)
Neck	45.4 *	18.5	18.9 ***
Head	16.6	21.0	30.8 ***
Chest	9.9 *	28.6 **	10.3
Abdominal	6.1	8.4	9.0
Upper limb	10.6	5.9	11.5
Lower limb	11.5	17.7	20.5
Outcome (% mortality)	0.9	2.5	6.4***
Hospital admission (%)	16.5 *	47.1	48.7 ***
ICU admission (%)	4.7 *	16.8	17.9 ***
Treatment (%)
None	86.4 *	68.9	70.5 ***
Minor surgery	7.3	12.6	16.7 ***
Elective surgery	5 *	14.3	7.7
Emergency surgery	1.4	4.2	5.1
Injury Severity Score (ISS) (%)
Slight(ISS ≤ 3)	82.3 *	52.9	52.6 ***
Moderate(ISS 4 - 8)	10.4	14.3	19.2
Severe(≥ 9)	7.3 *	32.8	19.2 ***
Admission days (%)
Return home	83.5 *	52.9	51.3 ***
Less than 7 days	4.0	6.7	10.3
for 7 - 13 days	3.1	6.7	9.0
for 14 - 27 days	3.9	12.5	6.5
more than 28 days	5.6 *	21.0	23.1***

* group 1 is significantly different (P ≤ 0.01) from group 2

** group 2 is significantly different (P ≤ 0.01) from group 3

*** group 3 is significantly different (P ≤ 0.01) from group 1