Among these 13 immune cells, 6 immune cells were positively correlated with ADHD risk (OR > 1) (Fig. 4C), including CD27 on IgD- CD38dim, CD27 on sw mem, CD27 on memory B cell, CD4 on activated Treg, CD27 on unsw mem, and CD3 on naive CD8br. This evidence concerns the gene CD27 and attention deficit-hyperactivity disorder.