Reliability and Feasibility of the First-Episode Psychosis Services Fidelity Scale-Revised for Remote Assessment

The authors sought to evaluate the interrater reliability and feasibility of the First-Episode Psychosis Services Fidelity Scale-Revised (FEPS-FS-R) for remote assessment of first-episode psychosis programs according to the coordinated specialty care model.

The authors used the FEPS-FS-R to assess the fidelity of 36 first-episode psychosis program sites in the United States with information from three sources: administrative data, health record review, and phone interviews with staff. Four raters independently conducted fidelity assessments of five program sites by listening to each of the staff interviews and independently rating the two other data sources from each site. To calculate interrater reliability, the authors used intraclass correlation coefficients (ICCs) for each of the five sites and across the total scores for each site.

Total interrater reliability was in the good to excellent range, with a mean ICC of 0.91 (95% confidence interval = 0.72-0.99, p<0.001). Two first-episode psychosis program sites (6%) achieved excellent fidelity, 25 (69%) good fidelity, and nine (25%) fair fidelity. Of the 32 distinct items on the FEPS-FS-R, 23 (72%) were used with good or excellent fidelity. Most sites achieved high fidelity on most items, but five items received ratings indicating low-fidelity use at most sites. The fidelity assessment proved feasible, and sites required on average 10.5 hours for preparing and conducting the fidelity review.

The FEPS-FS-R has high interrater reliability and can differentiate high-, moderate-, and low-fidelity sites. Most sites had good overall fidelity, but the FEPS-FS-R identified some services that were challenging to implement at many sites.