Fig. 8. Correlation tests between the volume of intact spinal cord tissue, cavitation and the lesion. Pearson correlation tests were performed to determine whether there were linear relationships between the volume percentages of intact parenchyma, lesion and cavitation. (A) There appears to be a strong inverse relationship between the volume of intact nervous tissue and the volume of lesion in the untreated control group and in the immediate and delayed PEG-treated groups. Thus, an increase in the volume of spinal cord sparing translates into a decrease in lesion formation. (B) A correlation between the volumes of undamaged tissue and the volume of cysts was observed only in the delayed PEG-treated group. (C) The amount of cavitation appears to be related to the amount of lesion being formed in the experimental spinal cords. Note that the correlation test for only the delayed PEG-treated group was statistically significant (P<0.05).
