Table 3 Haemoglobin concentrations in residents living at 3500–4000 m and at sea level.

	Haemoglobin in males (g/dl)	Haemoglobin in females (g/dl)
Sea level	15.3	13.4
Bolivia	17.9	16.8
Tibet	16.7	15.0
Ethiopia	15.9	15.0

Haemoglobin concentrations collected from studies of high altitude residents living at altitudes of 3500–4000 m compared to sea level residents from the USA.²⁸,³⁰