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 preterm infants and full-term infants. BSITD-III was administered at 12 months corrected age. The performance scores for the three BSITD-III subscales were calculated according to the child’ chronological age and considering the BSITD-III request for correction referring to the 40th week or the 37th week of gestation. Results indicate that corrected age should be used with the cognitive subscale only, not with the Motor nor with the Language ones.