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Table 1 Traditional FMEA scale for occurrence.

From: Quality of fixed dose artemether/lumefantrine products in Jimma Zone, Ethiopia

Probability of failure Possibility of failure rates Rank
Extremely high: failure almost inevitable ≥ 1 in 2 10
Very high 1 in 3 9
Repeated failures 1 in 8 8
High 1 in 20 7
Moderately high 1 in 80 6
Moderate 1 in 400 5
Relatively low 1 in 2000 4
Low 1 in 15,000 3
Remote 1 in 150,000 2
Nearly impossible ≤ 1 in 1,500,00 1