title: Brief report: trajectories of glycemic control over early to middle adolescence.
abstract: OBJECTIVE
  To identify distinct patterns of glycemic control over early to middle adolescence, and to determine whether psychosocial variables predicted those patterns.
  
  
  METHODS
  We used trajectory analysis to examine glycemic control over 5 years among adolescents with type 1 diabetes who were of age 12 on average at study start (n = 132). Well-being, relationships, and self-care behavior were assessed with in-person interviews. Blood glucose testing was determined from blood glucose meters, and missed clinic appointments and glycosolated hemoglobin were obtained from medical records.
  
  
  RESULTS
  We identified two distinct clusters of individuals, a stable good glycemic control group and a poorer deteriorating glycemic control group. Individuals in the deteriorating control group were characterized by higher peer conflict, more negative diabetes emotions, fewer blood glucose tests, and more missed clinic appointments.
  
  
  CONCLUSIONS
  Psychosocial variables and behavioral markers of self-care may predict the course of glycemic control over early to middle adolescence.
authors.affiliation: Department of Psychology, Carnegie Mellon University, Pittsburgh, PA 15213, USA. vh2e@andrew.cmu.edu
authors.forename: Vicki S
authors.initials: VS
authors.lastname: Helgeson
authors.forename: Pamela R
authors.initials: PR
authors.lastname: Snyder
authors.forename: Howard
authors.initials: H
authors.lastname: Seltman
authors.forename: Oscar
authors.initials: O
authors.lastname: Escobar
authors.forename: Dorothy
authors.initials: D
authors.lastname: Becker
authors.forename: Linda
authors.initials: L
authors.lastname: Siminerio
mesh_terms: D000293:Adolescent; D015190:Blood Glucose Self-Monitoring / Q000523:psychology*; D002648:Child; D003922:Diabetes Mellitus, Type 1 / Q000523:psychology / Q000628:therapy*; D004644:Emotions; D005260:Female; D006442:Glycated Hemoglobin / Q000378:metabolism; D006801:Humans; D016014:Linear Models; D008137:Longitudinal Studies; D008297:Male; D010287:Parent-Child Relations; D010349:Patient Compliance / Q000523:psychology*; D010379:Peer Group; D012306:Risk; D012944:Social Support; D014481:United States
chemical_list: D006442:Glycated Hemoglobin; C517652:hemoglobin A1c protein, human