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Higher-Order Factor Model for the E-RS. Confirmatory Fit Index (CFI)=0.958. Root Mean Square Error of Approximation (RMSEA)=0.073 (90% CI 0.050 to 0.096). Standardised Room Mean Square Residual (SRMR)=0.043. The E-RS is a derivative instrument, using the 11 respiratory symptom items from the 14-item EXACT. SOB, shortness of breath.
