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Prevalence of common myelofibrosis (MF)-related symptoms by International Prognostic Scoring System (IPSS) risk category (A) with splenomegaly and (B) without splenomegaly. Symptom prevalence at the time of MF diagnosis and IPSS risk stratification. In patients with splenomegaly, splenomegaly was most often recorded at the time of diagnosis (median time from MF diagnosis to reported splenomegaly was 1 day).
