title: Discriminating infants from different developmental outcome groups using the Test of Infant Motor Performance (TIMP) item responses.
abstract: OBJECTIVE
  The study evaluated the ability of each item of the Test of Infant Motor Performance to separate children into developmental outcome groups.
  
  
  METHODS
  Ninety-six infants with typical development (n = 67), cerebral palsy (n = 10) or developmental delay (n = 8) participated.
  
  
  METHODS
  A retrospective study was conducted using an existing Test of Infant Motor Performance data set. Discriminant analyses of items' rates of change at eight and 13 weeks' corrected age (independent variables) and outcome groups (dependent variables) were run.
  
  
  RESULTS
  Data obtained at eight weeks' corrected age showed better discrimination and predictive validity than at 13 weeks' corrected age. Item rates and directions of change combined differently to maximize the separation among outcome groups depending on age.
  
  
  CONCLUSIONS
  Motor behaviors that could identify cerebral palsy might differ with age, depending on (1) the stage of brain and body development, and (2) whether the motor ability level itself or the speed with which children acquire different motor skills is being evaluated.
authors.affiliation: Department of Occupational Therapy, Federal University of Minas Gerais, Minas Gerais, Brazil. vanessambarbosa@yahoo.com
authors.forename: Vanessa Maziero
authors.initials: VM
authors.lastname: Barbosa
authors.forename: Suzann K
authors.initials: SK
authors.lastname: Campbell
authors.forename: Michael
authors.initials: M
authors.lastname: Berbaum
mesh_terms: D002547:Cerebral Palsy / Q000503:physiopathology*; D002657:Child Development / Q000502:physiology*; D016002:Discriminant Analysis; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D009048:Motor Skills / Q000502:physiology*; D019957:Motor Skills Disorders / Q000503:physiopathology*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity