Table 1. Inclusion criteria for systematic review of psychological interventions for schizophrenia and bipolar disorder.

Criterion	Requirement for Inclusion
Population	Adults with schizophrenia or bipolar disorder. Studies that included individuals with dual diagnosis and/or co-morbidity were eligible for inclusion.
Intervention	Psychological interventions, which include ‘psychological therapy’, IAPT (Improving Access to Psychological Therapies), integrated care, collaborative care, talking therapies, psychological well-being practitioners, and/or liaison workers.
Comparator	Comparison with routine practice or no intervention, or with any of the above interventions.
Outcomes	Full economic evaluation relating costs and outcomes in an incremental cost-effectiveness ratio (ICER), or some measure of net benefit that incorporates health outcomes. Studies had to include a ‘cost-effectiveness acceptability curve’ (CEAC) or explicitly report probabilities of being cost-effective to allow for an assessment of uncertainty.
Setting and study type	Studies in a community, primary or outpatient setting. Studies that include a full economic evaluation comparing both costs and outcomes. Any study types/designs except case reports.
Other	Journal articles published in English language between January 2000 and November 2018.