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Mean School-wide Evaluation Tool (SET) fidelity scores at SWPBIS and comparison schools at baseline and years 1 through 4. Analysis of the SET data suggested a significant effect (ie, intervention condition × time interaction) for the overall SET score; Wilks’ Λ = .38, F(4,32) = 13.36, P = .001, η2 = .63, d = 3.22.
