| Characteristics | n (%) n = 153 |
| Age. Mean ± SD in years | 13.7 ± 2.5 |
| Age Group |
|
| 10 - 13 years | 70 (45.8) |
| 14 - 16 years | 57 (37.3) |
| 17 - <19 years | 26 (17.0) |
| Gender |
|
| Female | 79 (51.6) |
| Male | 74 (48.4) |
| Haemoglobin S distribution |
|
| Hb SS | 115 (75.2) |
| Hb SC | 31 (20.3) |
| Hb S/Sickle B+ thal | 5 (3.3) |
| Other | 2 (1.3) |