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Changes in pulmonary vascular resistance following asphyxia by cord occlusion and resuscitation with 21% oxygen or 100% oxygen. Birth refers to the onset of ventilation. *P < 0.05, data at birth compared with baseline; †first point when P < 0.05, compared with birth by ANOVA; ‡P < 0.05, compared with 21% oxygen at the same time point by ANOVA. There was no difference between the 2 curves by ANOVA repeated measures.
