BI-RADS density scores: intra-rater agreement and reliability (n = 992).

ᴋw = weighted kappa scores (Fleiss-Cohen, quadratic weights) a With the exception of the last row, which consists of kappa values with 95% confidence intervals. b The overall classification is based on the agreement between all three radiologists. The three radiologists all agreed in 570 of the cases. The other values were based on at least two radiologists agreeing (n = 413) or the middle value (n = 9). c The % agreement and the κw values were based on a subset (n = 250) that was scored twice by each radiologist. BI-RADS density scores: intra-rater agreement and reliability (n = 992).