RFS and PLT follow-up after splenectomy, according to IVIG response groups. a Kaplan-Meier curves of RFS of three IVIG response groups. b Boxplots of PLT counts after 1 week from splenectomy of three IVIG response groups. Points in plots are outliers, which are larger than 1.5 × interquartile range (distance between the first and third quartiles) from the 75th percentiles.