Brain histopathology score.

Mean scoring values (±SD) for the HE stainings.n = 6, 10, 12, 10, 11 for the control, 21%, 40%, 100% and Hyperoxia groups.There were no statistical difference between hypoxia-reoxygenated groups and the control group (p = 0.25–1.0) and between the control group and the hyperoxia group (p = 0.34 (cortex), p = 0.95–1.0 (striatum, hippocampus and cerebellum)).One piglet in the hyperoxia group had severe brain edema and was difficult to evaluate by HE staining.