The LCCC combines measures of accuracy and precision to assess the relational fit of the data to the line of concordance (45), and is defined as: rc 1⁄4 r Cb, where Cb is a bias correction factor that measures how far the best-fitting line deviates from 45 and is thus a measure of accuracy, and r is the correlation coefficient between estimated severity (Y) and actual severity (X), which measures precision (variation) or the scattering of points around the bestfitting line.