Typical parameters for the preterm infant at term equivalent age.

P50 is the partial pressure at 50% saturation. is taken from data on functional residual capacity. For all simulations unless otherwise stated: respiratory exchange ratio (RER) was assumed to be 0.8; shunt fraction (Fs) was adjusted to 8.7% to achieve a resting of 72 mmHg as is typical for normal healthy infants [58]; resting alveolar ventilation ( under normal conditions) was set to achieve resting .