OBJECTIVE	The purpose of this study was to compare the Alberta Infant Motor Scale ( AIMS ) and the Psychomotor Developmental Index ( PDI ) of the Bayley Scales of Infant Development-Dutch Second Edition ( BSID-II-NL ) in their ability to evaluate effects of an early intervention , provided by pediatric physical therapists , on motor development in infants with VLBW at 12 months corrected age ( CA ) .\