Development of an observational measure of therapy engagement for pediatric rehabilitation.

Purpose: The Pediatric Rehabilitation Intervention Measure of Engagement-Observation (PRIME-O) version was designed to capture signs of affective, cognitive and behavioral involvement for clients and service providers and in the client-provider interaction. Methods: Phase 1 examined interrater consensus and construct validity of a pilot version, using observer ratings of engagement indicators made while viewing videos of therapy sessions differing in high and low engagement (Sample 1). Phase 2 examined these properties in a 10-item version (Samples 2 and 3). Phase 3 examined the content validity of the 10-item version, using observed signs of child, youth and parent engagement, as reported in an interview study involving 10 service providers. Results: There was excellent interrater consensus for both versions and ratings significantly discriminated between videos differing in high and low engagement, providing evidence for construct validity. Content validity was demonstrated by service provider reports of engagement signs. More behavioral signs were reported for children and more cognitive signs were reported for youth and parents, providing evidence for the developmental appropriateness of the PRIME-O. Conclusions: The PRIME-O provides a multifaceted view of affective, cognitive and behavioral components of engagement in pediatric rehabilitation. The PRIME-O has potential utility for research, clinical practice and continuing education.