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| Variables | Complications | Frequency | P-value | |
| Saudis | Non-Saudis | |||
| (N=55) | (N=47) | |||
| Vaso-occlusive crisis (VOC) | ||||
| Yes | 16 | 16 | 32 | 0.001 |
| Urinary tract infection (UTI) | ||||
| Yes | 12 | 26 | 38 | 0.028 |
| Osteomyelitis | ||||
| Yes | 6 | 17 | 23 | 0.028 |
| Meningitis | ||||
| Yes | 2 | 5 | 7 | - |
| Ischemic stroke | ||||
| Yes | 5 | 11 | 16 | - |
| Avascular necrosis (AVN) | ||||
| Yes | 5 | 8 | 13 | 0.049 |
| Gallstone | ||||
| Yes | 4 | 0 | 4 | - |
| Pulmonary hypertension (PHTN) | ||||
| Yes | 0 | 1 | 1 | - |
| Death | ||||
| Yes | 0 | 1 | 1 | - |
