The confusion matrix linked above compares the Apple Watch to polysomnography equipment (which is the medical device used in a sleep lab). It doesn't _quite_ an

The confusion matrix linked above compares the Apple Watch to polysomnography equipment (which is the medical device used in a sleep lab). It doesn't _quite_ answer your question, since we're assuming the polysomnography equipment is ground truth, but it at least gives an idea of the discordance between a consumer device and a medical device.