Construct validity of the Coding Interactive Behaviour instrument for fathers of infants.

Observational instruments are proposed as the best method to assess the quality of parent-child interaction. However, the psychometric properties and theoretical foundations of these observational tools have been questioned. Further, very few studies have focussed on the construct validity of these instruments for father-child interaction quality. In this study, we examined the construct validity of the Coding Interactive Behavior (CIB) measure in a sample of 320 father-infant dyads. A four-factor model, previously found to fit mother-infant interactions, failed to demonstrate an acceptable model fit for our father-infant sample. Instead, a data-driven three-factor model was indicated to be a better fit. This model consists of the composites, 'Paternal Sensitivity', 'Paternal Positive Affect', and 'Child Engagement'. Interestingly, while these factors bear similarities to those found in maternal interactions, they manifest distinct characteristics for fathers. Our results emphasize the necessity of refining and validating observational tools specifically for diverse parent-child contexts.