Procedure
illness
INTERACTION
The trials were approved by University of New South Wales Human Research Ethics Committee (HC13234) and registered with the Australian New Zealand Clinical Trials Registry (ACTRN12616000280404). We obtained informed consent from all families before they completed a comprehensive in-person assessment taking approximately 2–2.5 h on five separate occasions: prior to treatment; following the first, second, and final treatment phases; and three months following treatment completion (see Supplemental Fig. All families received Parent-Child Interaction Therapy (PCIT; McNeil and Hembree-Kigin, Using a fixed dosage approach, we delivered 21 one-hour intervention sessions for free to individual families at the UNSW Parent-Child Research Clinic, an urban university research clinic in Sydney, Australia. Families participated in one parent-only Teach session and six parent-child Coach sessions in each of the three PCIT-CU treatment phases (i.e., CDI-CU, PDI-CU, and CARES). We attempted to schedule weekly sessions; however, families were often unable to attend weekly (e.g., due to illness or vacation). Average length of treatment for completers was 35.74 (