The mean utility index and health status were higher than one standard deviation compared with their respective mean values at baseline; these effect size values (utility index d = 1.2 and health status d = 1.1) are quite significant, according to Cohen's results for effect size interpretation (large d ≥ 0.80) [ 40 ].
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Patient Satisfaction with Spanish Pain Centers: Observational Study with More than 3,000 Patients.
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