Fig 3.

(a) Individual predicted volumes of distribution (V) for morphine, standardized to a 70 kg person, from the NONMEM post hoc step, are plotted against PMA. The dashed line represents the non-linear relation between clearance and age. (b) Magnification of (a) to reveal increased V in ventilator-dependent preterm neonates with no relationship to PMA (solid line).