The error in the calculated in-line PaO₂ of Quantum System at the 1st blood gas series has a strong correlation with the patient weight, which allows to derive a formula to compute the predicted in-line PaO₂. (A) A scattered XY plot was drawn for patient weight (X-axis) and error in mmHg of the 1st blood gas series (Y-axis). The data was fitted into a linear regression line, showing a strong correlation. R value is shown in the upper right corner. (B) A scattered XY plot was drawn for the calculated in-line PaO₂ of Quantum System (X-axis) and predicted in-line PaO₂ computed with our formula (Y-axis). The data was fitted into a linear regression line, showing a very strong correlation. R value is shown in the upper right corner. (C) Bland-Altman analysis of the calculated and predicted in-line PaO₂ shows strong agreement with a bias of 1 mmHg (bold solid line) and LOA of 101 and −99 mmHg (bold dashed lines). The X-axis represents the average of the calculated and predicted in-line PaO₂, while the Y-axis represents the difference between the calculated and predicted in-line PaO₂. (D) A scattered XY plot was drawn for the calculated in-line PaO₂ (X-axis) and FiO₂ (Y-axis) of Quantum System. The data was fitted into a linear regression line, showing a very strong correlation. R value is shown in the upper right corner.