Summary of peak relaxation times and volumesa
| 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).