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Repeated Measures AnalysisAppropriate Sample SizeMixed Model ApproachSample Size DeterminationTwo-sample T-testHealth Related Quality of LifeCovariance StructureSingle MeasurementMultiple TestingTesting ProceduresCorrelation MatrixSevere ObesityPsychosocial FactorsRandomized Clinical TrialRandom EffectsBariatric SurgeryModel FitError RateBody Mass IndexSample Size