title: Psychometric properties of the Glaucoma Treatment Compliance Assessment Tool in a multicenter trial.
abstract: OBJECTIVE
  To assess the psychometric properties of a new version of the Glaucoma Treatment Compliance Assessment Tool, a survey evaluating health behavior and glaucoma adherence using constructs from the Health Belief Model.
  
  
  METHODS
  Psychometric analysis.
  
  
  METHODS
  We administered the 47-statement Glaucoma Treatment Compliance Assessment Tool to 201 participants who were using a single bottle of an ocular hypotensive agent, and objectively measured adherence with medication event monitoring system devices over 60 days. Adherence was the percentage of days with correctly timed bottle openings. We used principal components analysis to determine construct validity, Cronbach's alpha for internal consistency reliability, frequency analysis for floor and ceiling effects, and Spearman rho for test-retest reliability. We determined predictive validity using univariate and multiple regression.
  
  
  RESULTS
  The mean (±SD, range) adherence percentage was 79.9% (±18.5%, 20.3%-100.0%). Principal component analysis loaded 24 questions into 6 components that were consistent with the Health Belief Model. All 6 components had Cronbach's alpha reliability between 0.601 and 0.797. No statements had floor or ceiling effects, and all statements had acceptable test-retest reliability. Multiple regression analysis showed 4 Health Belief Model statements, white race, older age, and married marital status to be associated with higher adherence (adjusted R(2) = 0.27, P < .001).
  
  
  CONCLUSIONS
  The newest version of the Glaucoma Treatment Compliance Assessment Tool showed acceptable psychometric properties. With further refinement, clinicians and researchers could use it to examine factors related to adherence and measure improvement in adherence with a change in health behavior attitudes.
authors: Devers Eye Institute at Legacy Health, Portland, Oregon.
authors: Gordon T
authors: GT
authors: Barker
authors: University of Colorado College of Nursing, Aurora, Colorado.
authors: Paul F
authors: PF
authors: Cook
authors: University of Colorado College of Nursing, Aurora, Colorado.
authors: Sarah J
authors: SJ
authors: Schmiege
authors: University of Colorado School of Medicine, Aurora, Colorado.
authors: Malik Y
authors: MY
authors: Kahook
authors: Vanderbilt University, Nashville, Tennessee.
authors: Jeffrey A
authors: JA
authors: Kammer
authors: Devers Eye Institute at Legacy Health, Portland, Oregon. Electronic address: smansberger@deverseye.org.
authors: Steven L
authors: SL
authors: Mansberger
mesh_terms: D000368:Aged; D000959:Antihypertensive Agents / Q000008:administration & dosage*; D001294:Attitude to Health; D005189:False Positive Reactions; D005260:Female; D005902:Glaucoma, Open-Angle / Q000188:drug therapy* / Q000523:psychology; D015438:Health Behavior; D006801:Humans; D008297:Male; D008875:Middle Aged; D008960:Models, Psychological; D015233:Models, Statistical; D009798:Ocular Hypertension / Q000188:drug therapy / Q000523:psychology; D009883:Ophthalmic Solutions; D010342:Patient Acceptance of Health Care; D011237:Predictive Value of Tests; D011594:Psychometrics; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires; D016903:Drug Monitoring
chemical_list: D000959:Antihypertensive Agents; D009883:Ophthalmic Solutions