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Table 4 Assessment of inter-reader (left panel) and inter-operator (right panel) concordance

From: Usability and acceptability of oral fluid hepatitis C self-testing among people who inject drugs in Coastal Kenya: a cross-sectional pilot study

Participant Assessment Total Re-reading of self-test by trained staff Re-tested with professional kit by trained staff
Positive Negative Invalid Positive Negative
Positive 12 11 1 0 11 1
Negative 110 0 110 0 0 110
Invalid 9 0 1 8   
Unsure 1 0 0 1   
Total   11 112 9 11 111
Concordance (%)   97.7% 99.2%
Cohen’s Kappa   0.92 0.95