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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 levelConfidence percentageMeaning in wordsInterpretation
10–19Not at all confident, complete guessLow confidence
220–39Not very confident, bit of a guess
340–59Not quite sure, uncertainMedium confidence
460–79Fairly sure, reasonably confidentHigh confidence
580–100Very confident, absolutely sure