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Figure 3. Scatterplot and linear regression line for vertebral bone marrow perfusion and age data in male and female subjects in groups 1 and 2. Natural logarithm transformation was calculated for the peak percentage on the y axis; a represents age in the following equations. For the male subjects, ln(y) = 4.2 - 0.017a, r² = 0.27, P = .01. For the female subjects, ln(y) = 5.89 - 0.04a, r² = 0.39, P = .01. Data derived from linear regression () and data from measurement () are shown.