title: Longitudinal trajectories of illness perceptions among adolescents with type 1 diabetes.
abstract: OBJECTIVE
  To examine development in illness perceptions of type 1 diabetes across adolescence and relationships with intelligence, diabetes responsibility, and diabetes outcomes.
  
  
  METHODS
  Illness perceptions were measured via the Illness Perceptions Questionnaire at 3 times, every 6 months in 213 adolescents (M age = 13.00; SD = 1.54) with type 1 diabetes. Intelligence and adolescents' perceived responsibility for diabetes were examined, and adolescents' report of adherence and quality of life (QOL), and glycosylated hemoglobin (HbA1c) from medical records addressed diabetes-related outcomes.
  
  
  RESULTS
  Linear growth models showed significant increases in perceptions of diabetes coherence, chronicity, consequences, personal and treatment control, and decreases in diabetes cyclicality and parental control across time. More favorable illness perceptions were generally associated with adolescent intelligence at baseline, more adolescent responsibility for management, better adherence and QOL, and lower HbA1c at each time point.
  
  
  CONCLUSIONS
  Results suggest that adolescents develop complex illness perceptions, which are associated with better diabetes management.
authors.affiliation: Department of Psychology, University of Utah and Division of Psychology, Department of Psychiatry, University of Texas Southwestern Medical Center at Dallas katherine.fortenberry@hsc.utah.edu.
authors.forename: Katherine T
authors.initials: KT
authors.lastname: Fortenberry
authors.affiliation: Department of Psychology, University of Utah and Division of Psychology, Department of Psychiatry, University of Texas Southwestern Medical Center at Dallas.
authors.forename: Cynthia A
authors.initials: CA
authors.lastname: Berg
authors.affiliation: Department of Psychology, University of Utah and Division of Psychology, Department of Psychiatry, University of Texas Southwestern Medical Center at Dallas.
authors.forename: Pamela S
authors.initials: PS
authors.lastname: King
authors.affiliation: Department of Psychology, University of Utah and Division of Psychology, Department of Psychiatry, University of Texas Southwestern Medical Center at Dallas.
authors.forename: Tammy
authors.initials: T
authors.lastname: Stump
authors.affiliation: Department of Psychology, University of Utah and Division of Psychology, Department of Psychiatry, University of Texas Southwestern Medical Center at Dallas.
authors.forename: Jorie M
authors.initials: JM
authors.lastname: Butler
authors.affiliation: Department of Psychology, University of Utah and Division of Psychology, Department of Psychiatry, University of Texas Southwestern Medical Center at Dallas.
authors.forename: Phung K
authors.initials: PK
authors.lastname: Pham
authors.affiliation: Department of Psychology, University of Utah and Division of Psychology, Department of Psychiatry, University of Texas Southwestern Medical Center at Dallas.
authors.forename: Deborah J
authors.initials: DJ
authors.lastname: Wiebe
mesh_terms: D000293:Adolescent; D001294:Attitude to Health; D003922:Diabetes Mellitus, Type 1 / Q000523:psychology*; D019468:Disease Management; D005260:Female; D006442:Glycated Hemoglobin / Q000032:analysis; D006801:Humans; D008297:Male; D010349:Patient Compliance / Q000523:psychology*; D010465:Perception; D011788:Quality of Life / Q000523:psychology*; D012648:Self Care / Q000523:psychology*; D011795:Surveys and Questionnaires
chemical_list: D006442:Glycated Hemoglobin
keywords: adherence; adolescents; illness perceptions; metabolic control; quality of life; type 1 diabetes