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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%