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| Ever Exposed to Hydroxyurea | Never Exposed to Hydroxyurea | |||
| Year | Proportion of Patients Transfused | Transfusions/Transfused Patients | Proportion of Patients Transfused | Transfusions/Transfused Patients |
| 2006 | 4% | 2.0 | 12% | 1.5 |
| 2007 | 4% | 3.4 | 9% | 1.4 |
| 2008 | 3% | 1.8 | 10% | 2.0 |
| 2009 | 2% | 1.0 | 8% | 1.4 |
| 2010 | 2% | 1.0 | 10% | 1.5 |
*PRBC = Packed Red Blood Cells.
