^a)Forty patients were found to have primary ITP. ^b)Sixteen patients were found to have primary ITP. ^c)Response to dapsone was defined as a platelet count >50×10⁹/L.

Abbreviations: CR, complete response (>10×10⁹/L); ITP, immune thrombocytopenia; NR, no response (<5×10⁹/L); PR, partial response (5–10×10⁹/L); R, response (>5×10⁹/L).