Normative childhood repetitive routines and obsessive compulsive symptomatology in 6-year-old twins
Background: To investigate the association between normative repetitive routines of childhood and paediatric obsessive compulsive symptom syndrome (OCSS) and the extent to which it is genetically mediated. Methods: In a two-phase design a community sample of 4,662 6-year-old twin-pairs were sampled and 854 pairs were assessed in the second phase for normative repetitive routines using the Childhoo
