Figure 13

Stratified analyses for the gross motor INTER-NDA domain and two WHO Gross motor milestones items, (running and climbing upstairs), according to three potential effect modifiers: Distraction index (No = <3 distracting factors; Yes = ≥3 distracting factors, (distracting factors were defined as (a) the mother being pregnant, (b) the mother working outside the home and (c) the mother not being the main person feeding the child)); external sociability (No = child has never attended nursery; Yes = child has attended nursery); competition/intrusion (No = first child; Yes = multiparous mother). Interactions were tested using Wald tests, with p = 0.010 gross motor/distraction index; p = 0.027 gross motor/distraction index; p = 0.016 “runs”/distraction index; p = 0.017 “runs”/distraction index and p = 0.018 climbs upstairs/ external sociability. Statistically significant interactions are shown in blue. Models were adjusted for age at assessment, sex, gestational age at birth, birth weight, birth length, NICU stay, maternal education, maternal age, fetal head circumference z-score, postnatal smoking exposure, and length z-score at 2 years. With robust standard errors.