From: Improving the exchange of lessons learned in security incident reports: case studies in the privacy of electronic patient records
Kappa statistic
Strength of agreement
Less than 0.0
Poor
0.0 to 0.20
Slight
0.21 to 0.40
Fair
0.41 to 0.60
Moderate
0.61 to 0.80
Substantial
0.81 to 1.00
Almost Perfect