Table 1.

PICOS Criteria for Study Inclusion

Population	All participants currently engaged in a behavioral health ACT based intervention. The review included all age ranges, races, ethnicities, and genders.
Intervention	ACT informed behavioral health interventions (e.g., chronic pain, stress management, medication uptake/adherence) delivered by non-mental health professionals. Intervention studies that specified they used ACT to inform the intervention or ACT as part of the building process. Studies with laypeople delivering the intervention or someone not typically delivering mental health services. Those who practice general medicine (doctors, nurses, etc.) not previously trained in ACT were included.
Comparison	Anyone not currently engaged in the ACT intervention undergoing testing including waitlist controls, active control, superiority, enhanced usual control, treatment as usual (TAU) and no intervention. The review was not limited by comparison studies.
Outcome	There were no specific outcomes of interest. Interventions examining a variety of health conditions and behaviors were included
Study Design	Both single and multiple arm study designs including non-randomized, quasi-experimental, waitlist control, quasi-experimental designs and randomized control trials. This review was not limited by study design.