To measure changes in the child's behaviour, we used the preschool version
of a clinically validated measure
of childhood emotional and behavioural
problems the Parent Account
of Child Symptoms (PrePACS).60 Data on positive and negative interactions were gathered using a video
of a child's mealtime coded according to the Mellow Parenting Scheme61 and a 5 min speech sample capturing parents»
descriptions of their children and their relationship with each child, coded according to the warmth
of their
initial statement and the percentage
of negative comments about the child.62 Speech samples and videos were coded following the training
of researchers by the developer according to the developer's manuals.61, 62 Researchers received training in the administration
of the PrePACS from the developer.