Development and validation of the Peer Interaction Macro-Coding System Scales (PIMS): a new tool for observational measurement of social competence in youth with spina bifida.

Many children with chronic health conditions encounter enduring difficulties in their peer interactions and friendships. This study aimed to create and validate scales derived from an observational coding system (i.e., Peer Interaction Macro-Coding System, or PIMS) in a sample of children with spina bifida and their peers. Participants were 106 target child-peer dyads who completed a battery of questionnaires and interviews and were videotaped performing 4 interaction tasks, which were then coded across multiple domains of social functioning. Five scales (i.e., Control, Prosocial Skills, Positive Affect, Conflict, and Dyadic Cohesion) were rationally derived based on a review of the literature and a panel of experts. Internal consistency and interrater reliability at the scale level were good to excellent for all 5 scales. Interscale correlations were in the low-to-moderate range for 4 of the scales, although the Dyadic Cohesion Scale was highly correlated with two other scales and was subsequently dropped. Convergent validity and discriminant validity were established by examining the 4 remaining scales in association with comparable questionnaire and interview data. The 4 PIMS scales appear to be reliable and valid measures of social competence and may enhance future multimethod research efforts aimed at learning more about peer interactions and overall social competence.