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Variation of T2 times of central aspect of lumbar IVDs from various normative reference T2 times^{^a}
Mean (ms) SD (ms) I^{^b} Inp^{^b} X^{^b} Xnp^{^b} Xs^{^b} Xsnp^{^b} Xc^{^b} Xcnp^{^b} Xcs^{^b} Xcsnp^{^b}
I 9.8 10.7 
Inp 11.7 13.4 <.001 
X 15.8 16.0 <.001 <.001 
Xnp 18.6 19.3 <.001 <.001 <.001 
Xs 15.5 15.3 <.001 <.001 .123 <.001 
Xsnp 18.3 18.6 <.001 <.001 <.001 .27 <.001 
Xc 17.2 17.3 <.001 <.001 <.001 .003 <.001 .027 
Xcnp 20.2 20.9 <.001 <.001 <.001 .001 <.001 <.001 <.001 
Xcs 21.8 20.7 <.001 <.001 <.001 .002 <.001 <.001 <.001 .031 
Xcsnp 25.7 25.2 <.001 <.001 <.001 <.001 <.001 <.001 <.001 <.001 <.001 
↵a Variability parameters represent the difference between T2 times of the central aspect of the index IVD from the mean T2 times of the other healthy IVDs from same individual (I), the mean of T2 times of all other healthy lumbar IVDs (X), the mean T2 times of all other healthy lumbar IVDs at the same segmental level as the index IVD (Xs), T2 time of a randomly selected healthy IVD from a different individual but at the same segmental level as the index IVD (Xcs), the mean T2 times of 6 randomly selected healthy discs from different individuals (Xc), each representing a particular segmental level between the T12 through S1 levels. Inp, Xnp, Xsnp, Xcnp, and Xcsnp indicate corresponding values calculated using 52.4% of the central IVD regions with highest T2 values.
↵b P values based on a paired Student t test.