Clinical and laboratory features at diagnosis of 132 patients with prefibrotic myelofibrosis compared with those with primary myelofibrosis-fibrotic type. BarosiGiovanni RostiVittorio BonettiElisa CampanelliRita CaroleiAdriana CatarsiPaolo M. IsgròAntonina LupoLetizia MassaMargherita PolettoValentina ViarengoGianluca VillaniLaura MagriniUmberto 2013 §<p>P value refers to the difference between prefibrotic myelofibrosis and myelofibrosis-fibrotic type;</p>§§<p>P value refers to the difference between prefibrotic myelofibrosis and myelofibrosis-fibrotic type with bone marrow (BM) fibrosis grade 1;</p>§§§<p>P value refers to the difference between myelofibrosis-fibrotic type with BM fibrosis grade 1 and with BM fibrosis grade 2 or 3;</p>*<p>White-blood cell (WBC) count was corrected for the number of circulating erythroblasts;</p>**<p>Spleen index is the product of the longitudinal by the transverse spleen axis, the latter defined as the maximal width of the organ.</p>