The Bayley Scales of Infant Development-II and Children with Developmental Delays

Poor Predictive Validity of the Bayley Scales of Infant Development for Cognitive Function of Extremely Low Birth Weight Children at School Age

“…14,34,35 One problem noted within a few years of the introduction of the BSID II was that different scores could be obtained depending on the selection of the starting point of testing and scoring table used for preterm infants. [21][22][23]36 For example, the starting point for a 13-month-old child born 3 months early would be 10 months when correcting for preterm birth. This child might score more poorly than if testing had started on an item set corresponding to the postnatal or uncorrected age, 22 because starting at the CA may not allow infants to earn points on a higher item set.…”

“…Testing of the subjects was started at the age range corrected for prematurity according to suggestions of the Psychological Corporation 21 and other reports. 22,23 After initiation of testing at the CA, the examiner dropped down to lower levels if the child did not obtain a basal level by passing at least 5 items in an item set. Similarly, the examiner attempted to obtain a basal level at a higher range if the child failed Ͻ3 items at the corrected age level.…”

Stability of the Bayley Mental Scale of Infant Development with High Risk Infants

“…Second, for the BSID DQ calculations, the ratio of raw to standard scores in the mental age conversion chart is lower than that for the BSID-II, rendering the DQ calculations for the BSID less accurate, and comparisons between DQs for the two tests problematic. Third, different examiners administered the tests (i.e., there were different psychometrists in different regions), perhaps introducing variability in administration (e.g., item set selection), which can influence scores (Black and Matula, 2000;Gauthier et al, 1999;Ross and Lawson, 1997;Washington et al, 1998). Fourth, variability was likely increased also by heterogeneity in the medically fragile group, relatively wide age ranges, and differences in age cohorts.…”

Cognitive and neuropsychological outcomes: More than IQ scores

“…Additional controversy surrounds the BSID-II itself. If corrected age is used to determine the beginning item set (versus chronologic age), scores tend to be lower because the child is not automatically given credit for passing the earlier item set [Matula et al, 1997;Washington et al, 1998;Gauthier et al, 1999]. Length or duration of follow-up is a consideration; a minimum of at least 3 years appears necessary to determine if problems of mild to moderate severity exist.…”