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. 2008 Dec 17;337:a2825. doi: 10.1136/bmj.a2825

Table 2 Abbreviated injury scale (AIS), Head Injury Criterion (HIC), and symptoms of head injury19

AIS HIC Symptoms
1 135-519 Headache or dizziness
2 520-899 Unconsciousness <1 hour
3 900-1254 Unconsciousness 1-6 hours