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).