International Classification of Functioning, Disability and HealthDisability EvaluationSocial SecuritySocial WelfareDisabled PersonsIntellectual DisabilityInsurance, DisabilityDevelopmental DisabilitiesActivities of Daily LivingPensionsLearning DisordersMentally Disabled PersonsDisabled ChildrenPain MeasurementMobility LimitationQuestionnairesSeverity of Illness IndexLow Back PainMultiple SclerosisVeterans Disability ClaimsHealth StatusArchitectural AccessibilityQuality of LifeEmploymentChronic DiseaseSelf-Help DevicesRehabilitation, VocationalGeriatric AssessmentUnited StatesFollow-Up StudiesHealth Status IndicatorsWorkers' CompensationSick LeaveTreatment OutcomeWork Capacity EvaluationPainPrevalenceCost of IllnessLongitudinal Studies