Early poor mental health link to early puberty

"The study, which followed almost 3,500 children from age four through to 11, found boys with an onset of puberty by eight to nine years of age had greater behavioural difficulties and poorer emotional and social adjustment from early childhood (four to five years of age). This pattern continued through to early adolescence. Girls with early puberty had more difficulties in emotional and social adjustment from early childhood, but not the behavioural problems found in boys...."
http://medicalxpress.com/news/2013-04-early-poor-mental-health-link.html