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Table 3: Univariate relationships of MRI metrics with healthy subject characteristics^{^a}
Metric Age Sex (M vs F) Height Weight Cervical Cord Length
CSA (mm²) r = −0.25 (P = .12) 80.0 ± 11.2 vs 73.5 ± 8.5 (P = .03^{^b}) r = 0.31 (P = .06^{^c}) r = 0.34 (P = .03^{^b}) r = 0.51 (P < .001^{^b})
FA r = −0.43 (P = .009^{^b}) 0.658 ± 0.037 vs 0.663 ± 0.034 (P = .75) r = −0.02 (P = .89) r = −0.26 (P = .12) r = 0.11 (P = .53)
MTR r = −0.25 (P = .11) 48.8 ± 2.5 vs 51.4 ± 2.7 (P = .006^{^b}) r = −0.41 (P = .008^{^b}) r = −0.40 (P = .01) r = −0.18 (P = .26)
T2*WI WM/GM r = 0.31 (P = .06) 0.863 ± 0.034 vs 0.858 ± 0.031 (P = .64) r = −0.12 (P = .48) r = 0.31 (P = .06^{^c}) r = −0.09 (P = .55)
↵a Values for sex are reported as mean ± SD, and other values are Pearson correlation coefficient. FA, MTR, and T2*WI WM/GM ratios are extracted from WM, while CSA of the spinal cord is measured, averaged across C1–C7.
↵b Significance (P < .05).
↵c Trends (P < .10).