PDSCRs in ITs, immune thrombocytopenia, and controls. Disorders with only 1 examined patient are not reported. Line in the middle of the box is the median, box is defined by the 25th and 75th percentiles (Q1 and Q3), and the ends of the whiskers are the most extreme values within Q3 + 1.5(Q3 − Q1) and Q1 − 1.5(Q3 − Q1), respectively. The dashed horizontal line indicates the best cutoff value for distinguishing ITs with normal or slightly decreased platelet size from the other forms of ITs and immune thrombocytopenia.