title: [Interrater reliability of the Bayley III test in the Italian Northern-Adriatic Cohort II].
abstract: OBJECTIVE
  to assess the agreement between two trained psychologists who administered the Bayley Scale of Infant Development III (BSID III) to detect neurodevelopment deficits in a cohort of children within the Northern Adriatic Cohort II (NAC II) longitudinal study, which aims to assess the impact of mercury exposure through food consumption of mothers in pregnancy on their children's neurodevelopment.
  
  
  METHODS
  a reliability study was carried out. Two trained psychologists administered the test, each one scoring the test independently, and serving as the primary examiner for half of the sample and as the observer for the other half.
  
  
  METHODS
  a sample of 53 children of 18 months of age was enrolled consecutively within the Italian NAC II, and tested using the Bayley Scale of Infant Development III (BSID III) to detect neurodevelopment deficits.
  
  
  METHODS
  the cognitive, language, and motor scales of the BSID III were evaluated and the respective Intraclass Correlation Coefficients (ICC) were calculated.
  
  
  RESULTS
  overall, the ICCs for the cognitive and language scales were very high (≥0.98), while the ICCs for the motor scales were slightly lower, ranging from 0.86 (gross motor, scaled) to 0.97 (fine motor, scaled), but still higher than 0.80, reported as the general acceptable benchmark for psychological testing.
  
  
  CONCLUSIONS
  the interrater reliability of all BSID III scales for this sample of 18-month-old children is very high and assures comparable results between the two psychologists involved in the Italian NAC II study. The reasons are a common training, the joint evaluation of many children during the preliminary phase of the study, the discussion of inconsistent results, but also the "go no-go" nature of the items in BSID III.
authors.affiliation: Istituto di igiene ed epidemiologia clinica, Azienda ospedaliero universitaria di Udine deroma.laura@aoud.sanita.fvg.it.
authors.forename: Laura
authors.initials: L
authors.lastname: Deroma
authors.forename: Maura
authors.initials: M
authors.lastname: Bin
authors.forename: Veronica
authors.initials: V
authors.lastname: Tognin
authors.forename: Valentina
authors.initials: V
authors.lastname: Rosolen
authors.forename: Francesca
authors.initials: F
authors.lastname: Valent
authors.forename: Fabio
authors.initials: F
authors.lastname: Barbone
authors.forename: Marco
authors.initials: M
authors.lastname: Carrozzi
mesh_terms: D002657:Child Development; D002675:Child, Preschool; D015331:Cohort Studies; D002658:Developmental Disabilities / Q000175:diagnosis*; D003943:Diagnostic Techniques, Neurological / Q000706:statistics & numerical data; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007558:Italy; D008297:Male; D009420:Nervous System / Q000254:growth & development; D009483:Neuropsychological Tests / Q000706:statistics & numerical data; D015588:Observer Variation; D015203:Reproducibility of Results