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Table 1 Frequency and proportion of decedents’ highest Abbreviated Injury Scale (AIS) injury severity score

From: Characterization of fatal injuries in oil and gas industry-related helicopter accidents in the Gulf of Mexico, 2004–2014

AIS severity

AIS severity score

Frequency

Proportion

Critical or maximal

AIS 5–6

25

71.4%

Severe

AIS 4

5

14.3%

Serious

AIS 3

3

8.6%

Moderate or minor

AIS 1–2

2

5.7%