International Classification of Functioning, Disability and HealthDisability EvaluationSocial SecuritySocial WelfareDisabled PersonsIntellectual DisabilityInsurance, DisabilityDevelopmental DisabilitiesActivities of Daily LivingPensionsLearning DisordersMentally Disabled PersonsDisabled ChildrenEducational MeasurementQuestionnairesPain MeasurementVeterans Disability ClaimsSeverity of Illness IndexMobility LimitationLow Back PainUnited StatesMultiple SclerosisFollow-Up StudiesHealth StatusProspective StudiesQuality of LifeCross-Sectional StudiesChronic DiseaseLongitudinal StudiesGeriatric AssessmentArchitectural AccessibilityTreatment OutcomeEmploymentReproducibility of ResultsWorkers' CompensationPrevalenceSelf-Help DevicesRehabilitation, VocationalCohort StudiesHealth Status IndicatorsRisk FactorsMusculoskeletal DiseasesSick LeaveWork Capacity EvaluationPainCost of Illness