Is intelligence of preterm children different from full-term children? Commentary on Rapuc et al. (2023).

Rapuc et al. (Journal of Child Psychology and Psychiatry, 2023) found that Full-Scale IQ of preterm children is significantly lower than full-term children. Also, although the structure of intelligence appeared to involve the same clusters of cognitive ability, relations between abilities were stronger in preterm children, implying that abilities are more differentiated in full-term than in preterm children. This commentary examined if these findings hold when different modelling methods are used. Instead of the network analysis used in the target article (Rapuc et al., 2023), I used confirmatory factor analysis and special forms of structural equation modelling designed to capture interactions between processes and their differentiation from general cognitive ability. I found, in line with the target article, that premature children scored lower overall in cognitive ability, and that cognitive processes are more strongly related in preterm than in full-term children. However, in contrast to the target article, specific abilities tended to differentiate with increasing general ability in preterm rather than in full-term children. In full-term children, increases in specific abilities were commensurate with increases in general ability. These differences may reflect slower development in preterm children and stronger dependence on executive processes dominating in preschool. Clinical implications are discussed.