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Demographic Information on Study Sample (n = 159)
| Age M (SD) R | 15.73 (3.63) 7.26 – 21.82 |
| Gender % (N) | |
| Male | 44.7% (71) |
| Female | 55.3% (88) |
| Ethnicity | |
| Black or African-American | 86.0% (135) |
| Hispanic | 5.7% (9) |
| SCD type | |
| HbSS | 67.7% (107) |
| HbSC | 21.5% (34) |
| HbSBeta+−thalassemia | 7.0% (11) |
| HbSBeta0−-thalassemia | 3.8% (6) |
| Long-term Therapy | |
| Hydroxyurea | 42.7% (67) |
| Chronic Transfusion | 13.3% (21) |
M-mean, SD-standard deviation, N-number, R-range
