Bayley Scale of Infant and Toddler Development (BSITD-III). Chronological Or Corrected Age: Which is More Appropriate to Assess Preterm Infants' Cognitive, Linguistic, and Motor Performances?

The use of chronological or/and corrected age administering BSITD-III in preterm children was investigated in a sample of 154 children: 76 preterm infants and 78 full-term infants. BSITD-III was administered at 12 months corrected age. The performance scores were calculated following a. the child’chronological age; b. AAP’s (2009) indications; and c. WHO (2012) indications for the three BSITD-III subscales. Results indicate that corrected age should be used with the cognitive subscale only (not with the Motor nor with the Language ones).