An explanation for this disparity between our findings and those of other studies may be related to the severity of the SCD genotype (73.3% of our patients had Hb SS), the greater proportion displaying SDB-suggestive symptoms increasing the risk of having sleep apnea, and our small sample size may have led to discrepancies in the proportion of patients with OSA. Here, GSTM1 is linked to sleep apnea syndrome.