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Table 3 Interpretation of the confidence levels attached to candidate matches [30]

From: Evaluating the re-identification risk of a clinical study report anonymized under EMA Policy 0070 and Health Canada Regulations

Confidence level

Confidence percentage

Meaning in words

Interpretation

1

0–19

Not at all confident, complete guess

Low confidence

2

20–39

Not very confident, bit of a guess

3

40–59

Not quite sure, uncertain

Medium confidence

4

60–79

Fairly sure, reasonably confident

High confidence

5

80–100

Very confident, absolutely sure