title: Anxiety and depression in children: a test of the positive-negative affect model.
abstract: OBJECTIVE
  To examine whether the two-factor model of affect presented by Watson and colleagues is applicable to school children.
  
  
  METHODS
  A child self-report scale of symptoms of depression and anxiety was administered to 624 school children in the third and sixth grades. Factor analyses were applied to extract factors of positive and negative affect. Reliabilities, correlations, and longitudinal analyses were performed to examine the developmental pathway of positive affect (PA) and negative affect (NA).
  
  
  RESULTS
  In contrast to Watson's early findings, our results indicate that the PA and NA scales are significantly negatively correlated cross-sectionally as well as longitudinally. Moreover, our findings indicate that children with high NA and low PA in the third grade display a worse prognosis than children who have either high NA or low PA.
  
  
  CONCLUSIONS
  A new affect model is needed for describing children's mood status. In addition, an important implication of these findings is that the occurrence of comorbid mood status in children confers a high risk for later emotional problems.
authors.affiliation: Department of Maternal and Child Health, School of Public Health, The University of North Carolina at Chapel Hill, 27599-7445, USA.
authors.forename: Li-Ching
authors.initials: LC
authors.lastname: Lee
authors.forename: George W
authors.initials: GW
authors.lastname: Rebok
mesh_terms: D000339:Affect; D001008:Anxiety Disorders / Q000453:epidemiology* / Q000523:psychology; D002648:Child; D003430:Cross-Sectional Studies; D003866:Depressive Disorder / Q000453:epidemiology* / Q000523:psychology; D005163:Factor Analysis, Statistical; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D015203:Reproducibility of Results