Table 1. Frequency index obtained by modifying the MSC/Circ. 1023

FI	Frequency	Definition	F (per fisher year)
7	Frequent	Likely to affect one fisher each month	10
5	Reasonably probable	Likely to affect 10 fishers once in a single year	10–1
3	Remote	Likely to affect 1,000 fishers once in a single year	10–3
1	Extremely remote	Likely to affect 20,000 fishers once in 5 years	10–5

FI, frequency index.