It's about 0% for sub-Sahara Africans, and in the 1% to 4% range for the rest. [1] This may not mean exactly what you think it means though. Your non-Neanderth

It's about 0% for sub-Sahara Africans, and in the 1% to 4% range for the rest. [1] This may not mean exactly what you think it means though. Your non-Neanderthal genes are also almost identical to the Neanderthal ones, otherwise interbreeding would have been impossible. It's just that genes come with slight variances that can be used to trace ancestry. E.g. you may also have heard that humans and chimpansee DNA is 98.8% identical, so there is obviously a different type of similarity metric being used there [1] https://www.science.org/doi/10.1126/science.1245938 https://www.science.org/doi/10.1126/science.1245938