Got 18/20, which I credit mostly to my calibrated display and photographer's eye for color. That said, both of the ones I missed were blue and I am wearing glasses that have some blue light filtering, which likely negatively impacted my perception of the blue parts of the color spectrum. It's food for thought as to whether or not I can effectively do post-processing of my photos while wearing glasses like these.
Interesting idea though. I wonder what the distribution looks like?