, 86 , 87 and cohort studies. 88 The female‐protective effect has also been shown in ADHD, 89 and may also apply to schizophrenia. 90 , 91 Genetic factors may also underlie sex differences in ADHD as showed by several family studies that show increased risk to the relatives of females compared with those of males with ADHD. 92 , 93 , 94 , 95
