Figure 4.

In a large Danish sample, the association between several specific infant motor developmental milestones and adult Non-Verbal IQ was moderated by parental social status (p-values immediately after the text, represented by the symbol *, indicate the level of significance for the interaction term with parental social class). In particular, stronger associations between milestone attainment and adult intelligence in the subsample from low social status families were observed (standardized regression for milestones predicting Non-Verbal IQ are reported). Adapted and reprinted with permission from Elsevier: Early Human Development [156] © (2015).