in addition to Cohen’s Kappa, since bias and prevalence affects Cohen’s Kappa. The guidelines for interpretation of the kappa coefficients suggested by Landis and Koch(1977) are as follows: Kappas 0 represent poor agreement, from 0.01 to 0.20 slight agreement, from 0.21 to 0.40 fair agreement, from 0.41 to 0.60 moderate agreement, from 0.61 to 0.80 substantial agreement, and from 0.81 to 1.00 almost perfect agreement.