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Table 3: 
Background hemodynamic parameters and clinical characteristics in the normal and increased OEF groups
Normal OEF (n = 9)Increased OEF (n = 4)
Hemoglobin (g/dL)13.5 ± 1.611.8 ± 0.5
O2 content (mL/dL)17.8 ± 2.515.6 ± 0.9
Mean blood pressure (mm Hg)93.7 ± 10.189.2 ± 5.7
PaCO2 during C15O2 inhalation (mm Hg)39.6 ± 2.340.0 ± 1.8
PaCO2 during 15O2 inhalation (mm Hg)39.9 ± 2.840.9 ± 2.2
Age (mean ± SD) (yr)55.8 ± 11.661.8 ± 5.9
Sex (male/female) (No.)*9/01/3
Symptomatic (No.)53
Hypertension (No.)64
Diabetes mellitus (No.)20
  • Note:—OEF indicates oxygen extraction traction; PaCO2, partial pressure of carbon dioxide.
  • * P < .05.