Figure 4

Dot plot depicting distribution of scores for Nottingham grade of 35 invasive breast cancers evaluated by the 13 pathologists. The slide number of the individual breast cancer is provided above each boxed entry. Grids at top and bottom represent individual pathologists, with the reference standard at 1. Interobserver reproducibility for Nottingham grade is good overall, but significantly better for grade III cancers than grade II cancers based on the reference standard.