Screening for major depressive episodes in Japanese patients with epilepsy: Validation and translation of the Japanese version of Neurological Disorders Depression Inventory for Epilepsy (NDDI-E)

► We translated the NDDI-E English version into Japanese (NDDI-E-J). ► We validated the effectiveness of the NDDI-E-J. ► The NDDI-E-J is a user-friendly self-rating instrument. ► The NDDI-E-J is an efficient tool for rapid identification of depression in epilepsy.