Validation of the Integrative Hope Scale in people with psychosis.

Hope is an important variable in mental health, particularly in the emergent field of research focused on recovery and well-being. This study validates the "Integrative Hope Scale" (IHS) for use in people with severe mental illness. Two hundred participants diagnosed with schizophrenia or schizoaffective disorder were assessed using the IHS, the Centre for Epidemiological Studies Depression Scale, and the Positive and Negative Syndrome Scale. Sixty participants were re-assessed after 14 days to establish re-test reliability. Confirmatory factor analysis was carried out; correlations between the scales and kappa coefficients were used to establish validity and reliability. The factor analysis confirmed a four-factor solution with excellent model fit, after minor modifications to the initial model. Discriminant validity and internal consistency were excellent. Test-retest reliability was good except for one item. This study suggests the scale to be a valid, reliable and feasible tool for the assessment of hope in people with severe mental illness. It provides a sound basis for future research on hope in mental health. For use in people with psychosis, we suggest some minor modifications to the scale.