title: Further validation of the Amblyopia Treatment Index parental questionnaire.
abstract: BACKGROUND
  The Amblyopia Treatment Index (ATI) is a parental questionnaire that has been used to assess the impact of patching or atropine treatment on the child and family in several amblyopia treatment studies. The 18-item parental questionnaire was designed with versions for treatment with patching or atropine. We pooled data across studies to further evaluate the validity of the ATI, to further assess the presence or absence of factors (subscales).
  
  
  METHODS
  A parent or guardian completed the ATI for 794 children who participated in 1 of 4 randomized clinical trials. Internal consistency reliability was assessed with Cronbach's alpha, and factor analysis was performed.
  
  
  RESULTS
  The ATI demonstrated high internal consistency reliability, with a Cronbach's alpha of 0.88 (95% CL = 0.87, 0.89). Factor analysis revealed the same 3 minimally overlapping factors found in the original validation study, which were again labeled "adverse effects," "treatment compliance," and "social stigma." Two of the 18 items did not load with any factor and could reasonably be omitted from future ATI administrations.
  
  
  CONCLUSIONS
  The ATI is a useful instrument for assessing the impact of patching or atropine treatment on the child and family.
authors.affiliation: Department of Ophthalmology, Mayo Clinic College of Medicine, Rochester, Minnesota, USA. pedig@jaeb.org
authors.forename: Jonathan M
authors.initials: JM
authors.lastname: Holmes
authors.forename: Samara
authors.initials: S
authors.lastname: Strauber
authors.forename: Graham E
authors.initials: GE
authors.lastname: Quinn
authors.forename: Stephen R
authors.initials: SR
authors.lastname: Cole
authors.forename: Joost
authors.initials: J
authors.lastname: Felius
authors.forename: Marjean
authors.initials: M
authors.lastname: Kulp
mesh_terms: D000328:Adult; D000550:Amblyopia / Q000628:therapy*; D001285:Atropine / Q000009:adverse effects / Q000627:therapeutic use; D002648:Child; D005163:Factor Analysis, Statistical; D006801:Humans; D010290:Parents; D010349:Patient Compliance; D011287:Prejudice; D016032:Randomized Controlled Trials as Topic; D015203:Reproducibility of Results; D012683:Sensory Deprivation; D011795:Surveys and Questionnaires / Q000592:standards*
chemical_list: D001285:Atropine