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J Clin Pathol 54:385-390 doi:10.1136/jcp.54.5.385

Observer accuracy in estimating proportions in images: implications for the semiquantitative assessment of staining reactions and a proposal for a new system

Table 7

Agreement between two class categorisation of real proportion (between 26% and 75%) of pink squares in the grid and that obtained by comparison of two unequal sized grids by all histopathologists (consultants and trainees)

Real (%)
26–50% 51–75%
κ Statistic 0.94 (95% confidence interval, 0.91 to 0.98).
Estimated (%)
26–50% 166 2
51–75% 8 174

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