Figure 2From: Changes in blood hemoglobin and blood gases PaO2 and PaCO2 in severe COPD overa three-year telemonitored program of long-term oxygen treatmentTime course of PaCO 2 values in the whole cohort and in each subgroup: t test between t 0 and t 1 . Hb, hemoglobin; PaCO2, partial pressure of arterial carbon dioxide.Back to article page