Characteristics of preterm lambs during fetal life and before pulmonary treatment at the two gestational ages studied.

Data are presented as mean±SEM. Cdyn: dynamic compliance; GA: gestational age; HR: heart rate; MABP: mean arterial blood pressure; MAP: mean airway pressure; OI: oxygenation index; PLV: partial liquid ventilation; SF: surfactant; VEI: ventilation efficiency index; VT: tidal volume; NS: non-significant. P value indicates significant differences in body weight, in baseline pre-treatment blood gas (Baseline), in hemodynamic and in mean airway pressure values between animals at the two GAs (one-way ANOVA).