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Table 2: Summary of peak relaxation times and volumes^{^a}
Control (n = 17) SCD (n = 14) Analysis P
Mean SD Mean SD
T1 Peak 1 504.6 122.1 691.2 103.8 <.0001
T1 Peak 2 715.6 115.5 775.0 72.8 .09
T2 119.7 12.7 77.6 21.4 <.0001
Secular-T2 131.7 17.4 81.9 23.8 <.0001
BM volume 429.7 80.7 500.7 69.8 .01
BM/ICV 0.33 0.07 0.38 0.06 .02
Note:—BM indicates bone marrow; ICV, intracranial volume.
↵a Not shown: there was an age association between T1 peak 1 times (P = .003) and T1 peak 2 times (P = .02).

	Control (n = 17)		SCD (n = 14)		Analysis P
	Mean	SD	Mean	SD	Analysis P
T1 Peak 1	504.6	122.1	691.2	103.8	<.0001
T1 Peak 2	715.6	115.5	775.0	72.8	.09
T2	119.7	12.7	77.6	21.4	<.0001
Secular-T2	131.7	17.4	81.9	23.8	<.0001
BM volume	429.7	80.7	500.7	69.8	.01
BM/ICV	0.33	0.07	0.38	0.06	.02