Table 4. Frequencies and return periods of accident, injury, and fatality

Items Value
Per ship Accident frequency (per ship year) 1.70 × 10–1
Injury frequency (per ship year) 1.66 × 10–1
Fatality frequency (per ship year) 6.95 × 10–3
Return period per accident (ship year) 5.87
Return period per injury (ship year) 6.03
Return period per fatality (ship year) 143.87
Per individual Individual accident frequency (per year) 5.34 × 10–2
Individual injury frequency (per year) 5.20 × 10–2
Individual fatality frequency (per year) 2.18 × 10–3
Return period per individual accident (year) 18.73
Return period per individual injury (year) 19.23
Return period per individual fatality (year) 458.93