“…In the present study also, older age, that is, ≥23 months, was identified as an unfavorable predictive variable for both short‐ and long‐term response to IVIG. If a higher dose of IVIG, such as 2 g/kg, like that used by Morimoto et al ., was used for subjects aged ≥23 months from the start of treatment, they might avoid unfavorable short‐ and long‐term outcome. Furthermore, if the IVIG dose was increased, prednisolone may be spared as a first‐line treatment and patient age may not be a risk factor any more.…”