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Table 11 Inter-observer agreement in the assignation of BI-RADS category to MRI studies

From: Magnetic resonance imaging in diagnosis of indeterminate breast (BIRADS 3 & 4A) in a general population

Radiologist Fleiss Kappa Gwet AC1**
Kappa P value CI* 95% AC1 P value CI 95%
R1,R2,R3,R4 0.20789 7.20E−03 (0.058,0.358) 0.65246 0 (0.603,0.784)
R1,R2,R3 0.30007 1.03E−03 (0.125,0.475) 0.69343 0 (0.566,0.754)
R2,R3,R4 0.20888 0.01814 (0.037,0.381) 0.66 0 (0.566,0.754)
R1,R2 0.30882 6.02E−03 (0.091,0.526) 0.66017 0 (0.536,0.784)
R1,R3 0.23186 0.0209 (0.036,0.428) 0.68642 0 (0.584,0.789)
R1,R4 0.07758 0.3919 (− 0.102,0.257) 0.56142 2.22E−16 (0.448,0.675)
R2,R3 0.36596 0.0034 (0.124,0.608) 0.80082 0 (0.701,0.901)
R2,R4 0.10859 0.26947 (− 0.086,0.303) 0.57269 9.88E−13 (0.44,0.706)
R3,R4 0.18008 0.07591 (− 0.019,0.379) 0.70786 0 (0.609,0.807)
  1. *Confidence Interval
  2. **First-order agreement coefficient