title: Development and prediction of hyperactive symptoms from 2 to 7 years in a population-based sample.
abstract: OBJECTIVE
  Children with hyperactive symptoms are often referred to mental health services. Given the frequency and persistent nature of hyperactivity, it is important to better understand its developmental course. This study identified the different developmental trajectories of hyperactive symptoms from 2 to 7 years and tested early predictors of high-level and persistent hyperactivity. These data may lead to earlier detection of at-risk children and to more effective interventions that take into account developmental considerations.
  
  
  METHODS
  Four data-collection cycles of a nationwide survey of Canadian children were used to track the early development of hyperactivity. Children were 0 to 23 months at the first cycle in 1994 and 6 to 7 years at the fourth cycle in 2000.
  
  
  METHODS
  Hyperactivity data were gathered from mothers on a biennial basis beginning when children were 24 months old. Information on potential prenatal and postnatal predictors was gathered from mothers at the first cycle.
  
  
  METHODS
  Group-based semiparametric mixture modeling was used to estimate developmental trajectories, and logistic-regression analysis identified predictors of hyperactivity.
  
  
  RESULTS
  Four trajectories of hyperactive symptoms were identified: very low, low, moderate, and high. Statistically significant predictors for high and persistent hyperactivity, after controlling for all other factors, were maternal prenatal smoking, child male gender, maternal depression, and hostile parenting.
  
  
  CONCLUSIONS
  For the majority of children, the frequency of hyperactive symptoms decreased or remained low from 2 to 7 years. However, 7 children in 100 were classified as having high initial levels of hyperactive symptoms that persisted over time. Several prenatal and early postnatal risk factors identified these children, although additional variables will need to be identified to accurately predict high and persistent hyperactivity. Findings suggest that preventive interventions could target high-risk families during pregnancy and early childhood.
authors.affiliation: School of Psychology, University of Ottawa, Ottawa, Ontario, Canada. eromano@uottawa.ca
authors.forename: Elisa
authors.initials: E
authors.lastname: Romano
authors.forename: Richard E
authors.initials: RE
authors.lastname: Tremblay
authors.forename: Abdeljelil
authors.initials: A
authors.lastname: Farhat
authors.forename: Sylvana
authors.initials: S
authors.lastname: Côté
mesh_terms: D017668:Age of Onset; D001289:Attention Deficit Disorder with Hyperactivity / Q000175:diagnosis*; D002648:Child; D002675:Child, Preschool; D005260:Female; D005544:Forecasting; D006801:Humans; D007223:Infant; D016015:Logistic Models; D008297:Male