Evidence Based Treatments

Although there are a growing number of studies assessing the effects of psychosocial interventions on various outcomes in children with physical illness, there are few studies that meet the Chambless criteria for efficacy (Beale 2006; Chambless and Hollon 1998). Chambless criteria were created to rate interventions as "well-established," "probably efficacious," or "promising." Well-established interventions have at least two valid between-group design studies or at least nine single-subject studies demonstrating efficacy. Ongoing challenges in evaluating psychotherapy studies with physically ill children include differences in research design, intervention modality, assessment instruments, techniques of analysis (e.g., differences in how the effect size is calculated), and study populations. Table 28-6 summarizes examples of representative reviews of randomized, controlled trials evaluating the efficacy of psychotherapy in physically ill children and adolescents.

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