Inter- and intra-observer assessment of the Galactogram Imaging Classification System (GICS)

Abstract

Background A new system for the classification of galactograms is reported. To date, there is no universally accepted classification system. Purpose To evaluate inter- and intra-observer agreement of the Galactogram Imaging Classification System (GICS) Material and Methods Six observers with different levels of experience retrospectively evaluated 30 galactograms using the GICS. Images were reviewed independently twice within a four-week period. The kappa statistic was calculated for intra- and inter-observer variability. Results The kappa for inter-observer agreement was moderate to substantial (range 0.41–0.72). Overall, the intra-observer kappa values were excellent (range 0.80–0.94). Conclusion The present study shows a good to very good inter- and intra-observer agreement with the GICS. We believe the GICS can be incorporated into daily practice.