Thank you, Lesley, for bringing this to my attention. Indeed, the studies I am looking at are showing lower hemoglobin levels for Rh negatives.
Another study has shown similar results:
https://medcraveonline.com/MOJT/distribution-of-haemoglobin-variants-abo-blood-group-and-rhesus-factor-among-nursing-students-of-madonna-university-nigeria.html
… and there are many more.
We still have yet to see Rh factor data in western Neanderthal specimens.
As more and more studies highlighting Rh factor come to life due to the COVID-19 situation, we may soon see the data we’ve been looking for for years.
Stay tuned…