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Table 1 Agreement for ordinal variables was examined using the weighted kappa coefficient. The agreement coefficients are interpreted as follows

From: Contrast-enhanced spectral mammography: successful initial clinical institute experience

Coefficient of agreement Strength of agreement
0.0–0.20 Slight agreement
0.21–0.40 Fair agreement
0.41–0.60 Moderate agreement
0.61–0.80 Substantial agreement
0.81–1.0 Nearly perfect agreement
  1. p-values < 0.05 were considered statistically significant