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The Dyadic Parent-Child Interaction Coding System, fourth edition (DPICS IV) is a behavioral observation measure used to assess parent-child interactions. The purpose of this study was threefold: (1) to examine the psychometric properties of the DPICS IV in a clinically referred Taiwanese sample of children aged 3-11 and their caregivers, (2) to provide normative data for this population, and (3) to examine normative age differences. A total of 104 Taiwanese clinically referred caregiver-child dyads completed the pre-treatment assessment for Parent-Child Interaction Therapy. Parent-report measures completed by the caregivers, as well as the DPICS IV observational data, were used for analysis. The DPICS IV had good inter-observer reliability and adequate discriminant, convergent and divergent validity for some DPICS IV indicators, including negative talk in child-led play and child compliance in parent-led play and clean-up. Differences were noted in parent-child interactions assessed by the DPICS IV based on the child’s age. The results of this study highlight good psychometrics for the DPICS IV in a clinically referred Taiwanese sample, and its established normative data can provide performance reference on the DPICS IV for this population. Future studies are needed to examine the test-retest reliability and predictive validity of the DPICS IV and to establish its normative data and psychometric properties with a non-referred Taiwanese sample. [ABSTRACT FROM AUTHOR]