Fig. 4.

Oxygen-saturated hemoglobin levels do not change with altitudes in Amhara and Oromo, whereas the increase in deoxyhemoglobin from low to high altitude is much greater in Oromo than Amhara. A: percent oxygen saturation is lower at high altitude in both Amhara and Oromo, but the drop is much greater in Oromo than Amhara. B: hemoglobin levels increase with altitudes in both Amhara and Oromo, but the increase in hemoglobin from low to high altitude is much greater in Oromo than Amhara. C: oxyhemoglobin levels do not change with altitudes, but Oromo have higher oxyhemoglobin levels than Amhara at low and high altitudes. D: deoxyhemoglobin levels increase with altitudes in Amhara and Oromo, but the increase is much greater in Oromo than Amhara.