Research Article

The Effect of Arterial pH on Oxygenation Persists Even in Infants Treated with Inhaled Nitric Oxide

Figure 2

An extreme example of a threshold response of a/A ratio to arterial pH in an individual patient. Correlation coefficient = 0.614, 𝑃 < 0 . 0 1 . In this instance simple linear regression is not the optimal statistical approach, as the relationship is clearly not linear.