Characteristics of the oxygen dissociation curves.

Means ± SE. Significance levels indicated as for Table 2. P50standard: standard half saturation pressure calculated from the curves of blood equilibrated with 6% CO2.*28.1±0.3 mmHg without the patient with the G551D mutation.均值±标准误（Standard Error，SE）。显著性水平标注规则同表2。标准半饱和压（P50standard）：由经6%二氧化碳（CO₂）平衡的血液曲线计算得到的标准半饱和压。*剔除携带G551D突变的患者后，对应数值为28.1±0.3 mmHg。