Validation of a four items version of the Functional Remission of General Schizophrenia scale (the mini-FROGS) to capture the functional benefits of clinical remission

Abstract

Abstract Objectives We previously developed the Functional Remission Of General Schizophrenia (FROGS) scale demonstrating first, reliable assessment in a cross-sectional study and second, good time-stability. The purpose of the present analysis was to propose a shorter version (mini-FROGS), more compatible with the limited time available in a psychiatric visit, focusing on the functional domains that have higher likelihood of being improved with higher and/or longer symptomatic remission in different cultural backgrounds. Methods We used multiple regressions to find the most informative items explaining increased length of symptomatic remission, using prospective data from a national observational multicenter survey. Then, the mini-FROGS was used in different European countries to test its between-center reliability, compared to other scales. Results Four domains were retained as capturing the maximum of symptomatic remission, namely (1) travel and communication, (2) management of illness and treatment, (3) self-esteem and sense of independence and (4) respect of biological rhythms. First, the mini-FROG was evaluated in 443 French patients with clinical remission and 22 without, and 12/18 months later in 140 patients still in clinical remission and 23 in relapse. In Europe, 295 schizophrenia patients were assessed with the mini-FROGS and other scales devoted to functional remission, allowing comparisons. The mini-FROGS showed good correlations with other scales in different countries and demonstrated good psychometric properties. Conclusion These results give evidence that a 4 items-only version of the FROGS scale may be useful to assess important aspects of functional remission, tightly linked to the length of clinical remission.