# What does k mean in terms of sensitivity and specificity

I am learning a paper Assessment of Deep Generative Models for High-Resolution Synthetic Retinal Image Generation of Age-Related Macular Degeneration, which uses an item "K" in the stats of sensitivity and specificity.

I googled a bit and didn't get a related hit. Could someone please give a hint? Thanks in advance.

• +1, because that is probably what it is supposed to be. However, I am puzzled. $\kappa$, as you write, measures the agreement between two raters in a multi-category classification task. But here, the paper reports separate $\kappa$s for each rater. This does not seem to make sense. The OP's best bet may be to contact the corresponding authors. – Stephan Kolassa Apr 7 at 8:14