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Table 2 Ranking criteria of the occurrence

From: Failure mode effect and criticality analysis of ultrasound device by classification tracking

Score

Occurrence

(failure frequency)

1

 < 0.02%

2

0.02%

3

 ≤ 0.2%

4

 ≤ 1%

5

 ≤ 2%

6

 ≤ 4%

7

 ≤ 6%

8

 ≤ 8%

9

 ≤ 10%

10

 > 10%