6MWT performance, hematological and clinical factors according to the presence of silent infarct; results are median (range) unless otherwise indicated.

6MWT, 6-Minute Walk Test; %PV = per cent of the predicted value; MCV, Mean Cell Volume; LDH, Lactate Dehyrogenase; AST, Aspartate Transaminase; ACS, Acute Chest Syndrome; VOC, Vaso-Occulsive Crisis having required an hospitalisation during the last 4 years.6MWT performance, hematological and clinical factors according to the presence of silent infarct; results are median (range) unless otherwise indicated.