Paths of cognitive and language development in healthy preterm infants

Objective: Despite the presence of many studies on difficulties related to premature birth, findings on developmental outcomes are heterogeneous. This could be explained from a biological and environmental point of view, but also from a methodological one. The aims of this study were as follows: assess cognitive and linguistic performance using the BSID-III in a population of healthy preterm infants at 24 and 36 months (corrected age); analyze whether the correction for prematurity should be applied, decide when to stop using corrected age and evaluate possible improvements between 24 and 36 months. Methods: Developmental outcome was assessed at 24 and 36 months (corrected age) with the BSID-III in 75 healthy preterm (GA = 32.5 +/- 1.97; BW = 1631.55 +/- 453.92) and 69 term-born children (GA = 39.77 +/- 1.00; BW = 3298.95 +/- 457.27). Results: Preterm infants had significantly lower scores than those of term infants in Cognitive (COG) and Language (LANG REC, LANG EC) scales of the BSID-III at both 24 and 36 months, considering both corrected (CA) and chronological (UCA) age. At 24 months, significant differences between corrected and chronological scores were found for each BSID-III scale, while at 36 months, significant differences between corrected and chronological scores were found for LANG scales. Only the scores in the COG scale were statistically different between 24 and 36 months (F=4.894, P = 0.009, eta(2) = 0.075). Considering only the preterm sample at 24 months, the differences between CA and UCA scores in the COG scale were significantly correlated to GA (p = 0.000) and days in hospital (p = 0.002;), while differences between CA and UCA scores in the LANG ESP scale were significantly correlated to GA (p = 0.010), days in hospital (p = 0.001), and birth weight (p = 0.007). At 36 months, no significant correlations were found.