Study flowchart and patient response. (A) Study flowchart, with all patients enrolled in study as of January 31, 2008. Patient numbers correspond to panel B. (B) Graphical representation of response for each study patient at each study visit. At each visit every patient was classified as either responder (Y, black) or nonresponder (N, gray). Response was defined as platelet count increased by at least 20 × 10⁹/L (20 000/mm³) to greater than 30 × 10⁹/L (30 000/mm³) with no IVIg treatment in the preceding 2 weeks. Blank space indicates no study visit in a given week.