Previous studies have focused on the association between maternal autoimmune disease and autism spectrum disorders, whereas attention-deficit/hyperactivity disorder (ADHD) has been less studied. Only 1 previous study examined the association between any maternal autoimmune disease and ADHD risk in children.8 A recent paper, however, set out to investigate the association between any (and specific) maternal autoimmune disease and ADHD in children, and to incorporate those results into a systematic review and meta-analysis on this topic.9