Table 6.
Probability of failure. The probability that the tree or selected tree part will fail within a year.
Probability of failure range
Probability of failure percentage
Probability ratio
1 Very high
51–100
1/1
2 High
11–50
1/2
3 Moderate
1–10
1/10
4 Low
0.1–0.9
1/100
5 Very low
< 0.1
1/1,000